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Benelli M4 Receiver Extension Removal This tutorial is to show how to disassemble any of the Benelli M4 receiver extensions. Introduction There is a lot of misinformation out there regarding disassembly of the Benelli M4’s receiver extension. Benelli USA will tell you that you will destroy the aluminum receiver if you attempt to remove the receiver extension. This is false. The receiver extension is installed with a green thread locker at the factory. In my experience, this thread locker is tougher to break than even red Loctite. Heat is mandatory to break down the thread locker’s hold or you will damage the fine threaded aluminum receiver. I would recommend the following steps be taken before you apply heat to your Benelli M4; 1. If you have tritium night sights in your rear sight, remove the aperture. 2. I recommend removing springs from your receiver and existing Receiver Extension. The application of extensive heat can damage springs. 3. Degrease your work area before applying heat to reduce smoke/fire hazard. Source the required tools for the job; a. Vice b. Heatgun or MAPP Torch (Preferred) c. 27mm Box Wrench d. 19mm Box Wrench e. Magna Tip Weaver Clamp Screw, 080-430-625WB f. Punch/Pin g. Loctite Primer 7471 h. Loctite Red 271 i. Snap Ring Pliers j. Wire Brush k. Oil/Grease l. Solvent   Some of these items aren’t mandatory to have, but you’ll have a much harder time doing the install without. I found the Magna Bit Weaver Clamp Screw bit works extremely well for removing the Stock Retaining Screw. I have not found a flathead screw driver large enough to fit. http://www.brownells.com/.aspx/pid=492/Product/MAGNA-TIP-reg-WINDAGE-CLAMP-SCREW-BITS Step by step disassembly process 1. Clear the weapon of ammunition and make it safe First off, ensure that your Benelli M4 is unloaded. Remove all ammunition from the weapon and remove it from your work area.

Holy crap. You drilled that pin out and you were successful?? Did you do it on a drill press or anything? The correct method would be to knock it out with a roll pin punch. I had one **** of a time drilling out that metal block that goes inside the trigger group. I pulled it out of the grip. Tossed it in a vice and hogged it out so the PITA fastener would slide through it. Then I just ran the drill through the soft plastic of the grip. Benelliwerkes advises that the fastener should just be lathed down in order to pass through the block without needing to modify it. Without the right tools, that can be a PITA itself. I guess you could put the screw in a drill chuck and spin it while laying a file on it. I figure if I ever needed to return to the stock format, Numrich Arms carries the internal guts of these collapsible stocks now.

Seems like this is the stick, and then they'll offer the carrot which will be a much more redacted version that the fudds will accept. It's time for people to draw a line in the sand.

I buy in massive bulk to take advantage of savings. Right now, I load 9mm for $7.50 per 100. So extrapolated, that's only like 1250 for all of them. Considering the cheapest Walmart value pack stuff is about $25.00 per hundred, the savings is apparent. My 45acp loads for about $13.50 per 100. That's a lot better than $40.00! Some of my loads cost more depending on what type of bullets I'm loading. Usually I load lead bullets from S&S Casting for plinking ammo. FMJ and JHP cost more, but they're easier and cleaner to load. I store the ammo loose in 30 and 50 caliber ammo cans. I fit about a 1000 9mm in a 30 caliber ammo can. A 1000 45acp fit in a 50 caliber can. The 45's are heavy, around 70 pounds a can with 230gn pills. I order bullets and have them shipped with USPS flat rate boxes for like 14 bucks each. They stuff 70 pounds of bullets into each one. Typically 3000 9mm fit in each box and 2000 45acp. On my last purchase, they shipped a dozen of these flat rate boxes at the same time. The contractor mail man was crying. His SUV was all squated out from the ton of lead in the back! Bottle neck cases like the 5.7 are more difficult to load. I haven't loaded any since I've heard it's a PITA. You have to trim bottle necked cases each time you shoot them. With .223, I have an electric trimmer, so I can trim them and resize them pretty quickly. I really like the Dillon equipment for loading. I have a 650XL that is loaded out. I probably invested about 1600 in loading equipment when I started. That gave me the equipment to load three calibers. You need a decent amount of room to load on. High volume rounds are somewhat tedious. There is a lot of prep work to be done before you actually load the cases. Straight up loading, I can crank a 1000 rounds out in about an hour and a half to two hours. By then I'm usually bored. I have a basic outline of the tedious process below; 1. Collect brass from the range. 2. Sort brass into like calibers. Scrap damaged, split, pitted, missing primered casings. 3. Tumble the like brass in the tumbler in walnut media. 4. Sort the like casings again, separate into specific calibers. 5. Wipe away dust on the cases and lubricate them for resizing. 6. Cycle the cases through the Dillon to resize and deprime the cases. 7. Return the resized cases to the tumbler with corncob media to remove the lubricant and to give a final polish. 8. Return cases to the Dillon press in order to load them. 9. Inspect each round by hand and insert it into a case gauge to determine uniformity. This final check is important since many cases tend to split during the loading process. 10. Store rounds in ammo cans for later use. Repeat as necessary.

What's the fin on the bottom of the stock for?

I started reloading in 2008 just prior to to the last big scare. We hit up local areas where people shoot and pick up all the brass. All the calibers are cleaned up and sorted. I sell off the stuff I don't use and reload my calibers. I think I'm sitting on around 15,000 loaded 9mm at the moment. Probably 18,000 45acp. Needless to say, it has to be stored down stairs on the cement pad. I probably made a 1000 bucks off selling the assorted other brass on gunbroker. I've amassed about 60K in 22lr. That crap is heavy!

Seems a little over priced to me. That's quite a premium over the existing stock market. I'd need to see more information on how much better of a stock it is to warrant twice the price. The forearm looks interesting. I'm interested to hear what the weight is. The rails appear to be effectively placed for mounting a weapon light.

625 dollars?

The difference in quality between the FFT and the carriercomp charging handle is that the carriercomp unit uses a steel shank. This means the carriercomp charging handle is less prone to deformation where it inserts into the bolt carrier. [/img] See how the engagement point on the Design Concept's bolt handle is all chewed up? FTT's will do the same since it is all titanium as well. A common misconception is titanium is stronger than steel. While this is true, it is by weight. Kind of like how spiderweb silk is stronger than steel by weight. Even though it has a steel shank, the weight of the unit is kept at an impressive 9.6 grams. The factory bolt handle is around 12 grams. [/img]

That's not as bad as some of the people getting bent over on gunbroker. The Five-Seven mags were always expensive anyway, so you're not getting too badly raped. I think I paid 34 a piece of them way back when. I think I paid 16 for the extensions. That price alone stings when you actually handle the magazine. The 10 round extensions are kind of mickey mouse in the way they fit. They certainly don't scream military quality when you're assembling them. The baseplate design sucks. Even with 30 rounders in it, the package is really lightweight. I usually carry the Five-Seven when hiking to compliment whatever rifle or shotgun I'm totting along. It's hard to beat having 91 rounds on tap in a very light package. One of the things that sucks about the Five-Seven and the Surefire X400 is that Surefire doesn't make a DG switch for the Five-Seven. If you do get buyers remorse within the next few days, realize you could flip it on Gunbroker for a nice profit. I believe the Five-Seven was released for civilian sales in 2004.

WMD Guns does NiB coating on pretty much whatever you want to do. http://www.wmdguns.com/ A lot of guys are dropping Jarvis barrels into these Five-Seven's as well. They're mainly for suppressor applications though. I don't have enough mags to part with any. I think I have 7 - 10. The pricing on Gunbroker for the Five-Seven is ridiculous. I saw one bid up to 2600 dollars earlier today. Side note about the WMD guns. A co-worker is doing his Benelli M4's bolt carrier right now through them. I'll report back if it has any operating benefit besides being easier to clean once it returns. Those mag rebuild kits fly legally in California even for weapons that weren't in production prior to the ban?

Pricing for the Five-Seven on gunbroker has reached full retard proportions. I think I picked mine up for like 950 brand new in November of 2010. The Five-Seven can be worked over some. It has a lame magazine disconnect that can be gotten rid of. Also, WMD Guns will disassemble the slide and NiB the metal parts inside the plastic casing. It was pretty cheap if I recall. I've been considering doing that for mine. I have a few thousand rounds on hand that I bought years back. Elite ammunition had a big shipment come through the other day, but I'm certain it's long gone. Damn Lybian's used up all the 5.7 during their ethnic cleansing. Allah Akbar!

Rocket, You bought a great gun. Can't imagine a FN Five-Seven with 10 round mags though. The pistol is incredible with the 20 and 30 round mags. Did you get the one with the low profile sights or the target sights? I haven't bought anything lately. I built up my SBR and my mag stash after the fascist was shoe horned back in. If I buy anything lately, it'll be more spare parts to keep what I have running. I do have to pick up my Sig Sauer P938 from my LGS on Monday. Kind of interested to see how badly their bones were picked over.

Theoretically, the H2O will function smoother. It will certainly be easier to clean. However, I've heard some owners have had issues with the H2O due to tollerance stacking. Such issues as the shell elevator hanging up. You'd do nearly as well sending a regular M4 off to a place like WMD or Robar and having select parts coated. My friend has his Benelli carrier at WMD guns right now for refinishing. I just hate to have a weapon down for six weeks. I'm not a fan of the silver finish on the exterior of the weapon. If I did it, I'd have to Cerakote the exterior. If I recall, this is not possible on the NP3 finish.

Didn't see this thread. The receiver extensions can certainly be removed with a heatgun. It's more work than doing a magazine tube, but it can be done. The same threadlocking compound is used on the receiver extension as is on the magazine tube. Probably the most complicated aspect is timing the receiver extension so the installation notches for the collapsible stock are set right. If not, your stock would install crooked. It's pretty easy to set right though, particularly if you have a collapsible stock on hand. You can collapse the stock on the extension, and use the comb of the stock as an index point. Once it points to the center of the rear iron sight housing, you know you're where you need to be. The extension doesn't bottom out when installing either. You have to see how your existing extension is screwed in so it is flush with the inside of the receiver. The extension will certainly screw in much deeper. If you screw it in too far, the collapsible stock's pistol grip portion won't grab the threads on the exterior of the receiver extension. The locking nut on the base of the receiver extension is what acts as a jam nut and holds the assembly timed. Needless to say, I used red locktite to retain both the extension and the lock nut.

The rear set are small on purpose. They're meant to give you a visual reference point to where the ghost ring is. Your eyes will be so close to the rear sight that the glowing image will blur anyway. In dark situations, you don't want a bright set of tritium glowing an inch from your eyes. It will obstruct your natural night vision.

The weapons in schools belong on trained adults hips. Kind of like how women shouldn't carry in their purses. Here in Arizona, it is rare to hear around car jackings or robberies because 10 - 15% of the population is armed and it is concealed most of the time. The criminal element is left guessing which person is a sheep and which is a sheep dog. It should be the same in schools. How many events have taken place where one of the administrators had to run to his car to get a weapon, then returned to the shooters location and took them into custody? Having the weapons onsite wouldn't be used to break up the school yard fights. That kind of thinking is akin to how people imagined blood running in the streets when the first CCW laws were enacted. another option is to hire real security contractors, not rent-a-cops. There is a big difference in training/quality. Real security is expensive. You'd be looking at about a million a year per small school. This would be an excellent opportunity for returning Veterans', but we all know our Government doesn't give a crap about them. All they do is try to exploit tragedies to push their own agenda. "Never let a good tragedy go to waste," is the slogan of comrade Emmanuel's isn't it? I'd consider having a part of the police station annexed in some schools to keep their presence and proximity up. With scumbags like this clown, they usually focus on what threatens them. I know I'd rather have someone shoot at me than at kids.

I was worried to click this thread when I read the title. Glad I did, nice set!

Who wants to bet this POS was on a laundry list of anti depressants? The day they order is to seize weapons is the day I resign. I don't think the admin will go that route. It's a bloodbath. I believe they'll restrict transfers and ban future sales of weapons with specific evil features. Basically like how California destroyed the ownership of "assault rifles." Basically the frog and the pot of water routine. I'm certainly not turning mine in. They can arrest me and give me free Obama care in prison with the 10+ million others who tell our criminal government FU. Overload the already overtaxed legal system. If If I'm in jail, the bank can have my underwater mortgage. Guess I'll stop paying my credit cards too. Come repo my unneeded car while you're at it. Don't mind me if I cancel my health insurance too. No grand shootouts with the Feds. That's foolish. Leave the violence to our Government. Peaceable dissent is the way to go. If these people want a real implosion, give it to them.

Thanks. There are a few features I like better on the HK MP5. Such as the paddle mag release, the possible folding stock and the forward mounted cocking handle. There are features on the AR platform that are better though. It's more ergonomic, more rail choices. Lighter. Cheaper parts. Far better trigger options. I imagine the AR in 9mm is fun to shoot suppressed. I had the opportunity to shoot a Sten and a Sterling 9mm that was full auto and suppressed a few times. It sounded like you were letting the air out of a tire. It ripped through 30 something rounds in like 1.5 seconds. Complete control too. Loading its mags weren't fun though.

Damn Rocket. I was impressed with myself doing 90 push-ups.

Clean build Unobtanium. I like your choices in sights and optics. I tweaked my handguards on the NSR some more. I was using the individual cover segments. I changed it out to the 7 segment sections on the sides. I pushed the 7th segment out over the end of the NSR to give the weapon a little more handguard protection. I spent some time relieving the back of the cover where the Mossie Tactic mount was interfering with the fit. Now it's a precision fit that you can't even tell was done when the cover is installed. Now the covers extend right out to the bayonet mounting ring on the Vortex.

Thanks. I'm happy with the way it has come out as well. The barrel length came out perfect. I must have measured it ten times to make sure I wasn't going too short. It will look and function much better as a SBR with a CTR stock on it. The weapon light is in the perfect position. You have to try really hard to even see the top of the X300 Ultra in the optic's field of view. You have to crane your head up and look downward. There is absolutely no barrel shadowing either. I could have installed any weapon light out there since price wasn't an issue. The X300 Ultra was by far the best option. The only option that wouldn't have worked is the X400. I tried one from a pistol I have, and the laser housing obstructs the front sight. I do carry a Glock 19, Gen 4. So the magazines are all interchangeable.