StrangerDanger

Oh yeah, 50 internet points for the first person who figures out how many 2 3/4" buckshot fit in a 20mm ammo can.

HK's fault:

A goal would be what you intend to use the weapon for. Such as, picking a specific light, activation system and so on. Whatever you choose, keep weight in mind for every item. Remove weight whenever possible. No matter how insignificant it may seem. Hookster's a good guy, when he's not out drumming up business for his vet girlfriend with his truck!

The coveted middle position.

Finally got some things squared away. Figured I'd snap a couple photos while I was in the war room. The lighting sucks... The collapsible stock is slick. I'm glad I finally got around to getting one. Right now I'm using a basic light setup with my Scout. No tape switch to the grip for now. The placement it is in is pretty intuitive and easy to use. I ditched the LaRue mount to bring the light closer to the rail and to save an ounce. I removed the shell carrier as well. The weapon feels a lot handier. My rear sling mount from Mesa is still inbound. I have a padded VCAS QD sling. I also have an enlarged safety coming some time this next week.

What is your goal for the rail system?

Just finished up my reinstall. It went fairly easy. There are a few things you should note before proceeding that will help you. Note how deep the recoil tube is screwed into your weapon. You don't just bottom out the extension when screwing it in like on the magazine tube. So you're going to have to time the tube. When I say time the tube, I mean you'll have to screw it in so that the stock isn't canted. If you try to screw the tube in all the way, it will eventually bottom out. However, when you attempt to screw the pistol grip assembly onto the weapon, the threads will not catch. Rule of thumb is to screw the extension in so the leading edge of the threads is flush with the inner surface of the receiver. Once you're in the ballpark, attach the collapsible portion of the stock, and collapse it all the way. The comb of the stock will act as your index gauge as it will point at the rear sight housing. You should still be twist the extension with the stock tail in place to finalize your adjustments. Once it is where you want it, tighten the locking nut with an open ended 1 1/16" wrench to secure the location. Remove the stock carefully, then use the closed ended 1 1/16" wrench to tighten the nut fully. Be careful that the extension itself isn't turning as you tighten the nut. I used blue locktite on my reassembly. I would recommend everyone else do as well. Since the extension doesn't bottom out on it's threading, the only thing that keeps it in place is the tension of the locking nut. Therefor, thread locker is mandatory to secure this location on both the recoil tube threads and the locking nut. The LOP improvement of the middle position when used with an Aimpoint T1 is vastly better. I probably won't use the fully extended length ever. I'm still awaiting a Mesa Tactical QD rear sling mount to finish this build revision. I probably won't get it done until after I return from SHOT. Stev

Surprisingly I received the package today from Numrich Arms. It is in fact a 3 position recoil tube on the complete assembly. I'd wager the stripped unit is as well. I'm glad I purchased the complete tube though, there are some minor design changes in the plunger. The finish on the plunger appears to be superior. I haven't reassembled yet since I had to go to work. Purchase with confidence.

Surprisingly I received the package today from Numrich Arms. It is in fact a 3 position recoil tube on the complete assembly. I'd wager the stripped unit is as well. I'm glad I purchased the complete tube though, there are some minor design changes in the plunger. The finish on the plunger appears to be superior. I haven't reassembled yet since I had to go to work. Purchase with confidence.

Surprisingly I received the package today from Numrich Arms. It is in fact a 3 position recoil tube on the complete assembly. I'd wager the stripped unit is as well. I'm glad I purchased the complete tube though, there are some minor design changes in the plunger. The finish on the plunger appears to be superior. I haven't reassembled yet since I had to go to work. Purchase with confidence.

A Botach swindle? Say it ain't so!

It just takes tools like a common stock from other makers. You have to unscrew it with a flat head from the butt stock. Just a little poke at it. Not really a deal breaker IMO. Just a step backwards from the ingenuity of the M4.

Not according to their customer service. I showed them the photo from Mesa Tactical. They indicated it looked like the 11707 variant shown. We'll see on monday though.

The following models come with a 1 position recoil tube: M1014 11703 The following models come with a 3 position recoil tube: 11707 11717 (Tan) 11724 (14" Entry Gun) The original 2 position stocks came out on the original military weapons. I'm not sure if the Marines are being issued 3 point models now. One would assume that it was an inline design change, and all current production models are now 3 position. I assume this to be true, because the 3 position stock technically has no benefit whatsoever to civilian ownership since they aren't meant to have the collapsible stock. Therefore, it must have been a military request.

Unless you have an Urbino.

Sure thing. I am expecting delivery on Monday. I spoke with customer Service at Numrich Arms. The cheaper one is a stripped unit. The more expensive one is a complete extension. Ie: It has the recoil spring, plunger, spring retainer and snap ring. My concern is that it will only be a 2 position unit rather than a 3 position. Here is my review on how to disassemble the extension from another thread: My M4 was purchased in 2004. It is a 11703 model. Which has the gay recoil extension that the M1014 has. This prevents the collapsible stock from collapsing. Since I just scored an awesome price on a collapsible stock (thanks HK), I figured it was time to upgrade this part. I just came downstairs from my lair. The extension is history. It took me about an hour or so to break it free. I was worried it wouldn't give up the ghost very easily. I used a basic heat gun and roasted the **** out it. I rigged up the receiver in my vice and placed the heat gun so it would cook the extension near the receiver without me holding it. You should take the recoil spring, recoil spring plug and the plunger out before roasting it to avoid damaging the spring mainly. This is pretty easy to do. At the base of the extension, use a pair of snap ring pliers to remove the snap ring. Then unscrew the recoil spring plug. It should be pretty easy to unscrew. It takes an odd shaped screw driver head. I just used the snap ring pliers points. The 1 1/16 nut at the base of the receiver twists off normally. Lefty loosy when looking at the receiver from the top, extension pointed towards you. Common threading. It took about 20 minutes of heat to get the nut off. This is why older posts opted for a torch. There is no way in **** a bic lighter would give you enough heat to do this job like I saw for another model of Benelli. Then, it took another 20 minutes or so on the receiver extension to break it free. I used a 3/4" wrench on the flat spots on the extension. This was the hardest part to remove, since Benelli didn't give us a very solid wrenching surface. This also uses the lefty loosy thread patterns. I mention this because when you're trying to break locktite, it really would be nice to know which direction you should be twisting. The receiver has the same green locktite that the magazine tube extension has. There is just a lot more thread to deal with. Hence the perception that it is harder to remove than the magazine extension. I'd rate that it is harder to do. But not seriously hard. Also, I noted that the locktite did not smoke like the magazine tube extension does. I gave the receiver a bath in BreakFree Powder Blast after the extension was removed. The threads were pretty clean. Tools: Vice (Mandatory) Heat Gun or Torch (Mandatory) Snap Ring Pliers (Mandatory) 3/4" Open Ended Wrench (Mandatory) 1 1/16" Closed Ended Wrench (Mandatory) Wire Brush (Recommended) Spray Solvent (Recommended) The receiver extension doesn't weigh as much as I had expected. I'll try to weigh it tomorrow at work on our postal scale. However, I'd guess that it weighs about 6.4 ounces. The 3 position model will weigh slightly less due to the amount of machine work on the exterior of the tube. I was kind of worried that I wouldn't be able to get it off myself. I'd say that using a heatgun is probably the safest way to remove the tube since you're using a lower controlled amount of heat opposed to roasting it with a propane torch. Just be sure to pick a good vice point, use padding and do not force it. It will take some force to remove the extension, but enough heat will get the job done.

Ordered one of these myself this past weekend. Looks fairly straight forward to install. Drive out the pin, try not to loose the spring and detent that holds the existing safety in place. Remove the old safety. Reverse for install.

Pull the trigger pack out, unscrew stock. DONE!

No it won't.

Just swap the tube out. ****, people in ban states pay good money for the tube you have so they can install the stock as a faux collapsible stock. The job isn't the easiest, but it isn't that hard to do really. Or, have a gunsmith do it. I'll give you a copy of the instructions on how to do it if you like. By next monday, I should know 100% sure if the source I have for the tubes is the proper 3 position units.

You can live with reusing the existing nut so long as you don't mangle it. Just apply a small amount of blue locktite and it should be good to go. Part Number 101. This is the part that you need: http://www.brownells.com/.aspx/sid=50339/pid=23654/Product/70098_FRONT_SIGHT_RETAINING_NUT_M4 As you mentioned, it's backordered. It's the only place I've seen them for sale. You could try to call Benelli and cry. Say it shook loose or something. They might just send you one for free. BTW, you need a 5.5mm open ended wrench for this nut.

You need a new recoil extension for the stock to collapse. It should lock into the fully extended position. When the stock installs at a 45 degree angle, continue pushing the adjustment button, now rotate it 45 degrees. Continue pushing the button and extend the stock about an inch. Rotate the stock again while pushing the button. I sourced a replacement recoil tube from Numrich Arms. I haven't received it yet. I will verify the type of tube it is when it comes.

Numrich Arms is pretty sure the recoil tube is the 3 groove model, but not 100%. The assembled vs stripped is just that. I'll verify when I receive it. My worry is they're counting the install groove.

If you plan on sticking with it, you could sell your 3 position recoil tube for 200 - 250$ and pay for the stock outright and then some. The sharks will be all over that in a heart beat.