Unobtanium

http://www.slip2000.com/art-swat2.html Here. These people actually have some experience with properly built ar15's. They run just fine with no cleaning. 15,000+ rounds. No problem. Piston systems are nothing but a marketing ploy/step back in actual performance when applied in the AR.

It's cleaner than a piston ar once you go suppressed IF you are using the proper port size or a switchblock. I'm more interested in suppressed performance, but its still plenty fine for more ammo than you can carry without a re lube needed. I fail to see any advantage what so ever to pistons. They weigh more, an impact accuracy to a small extent, are all proprietary, many cause carrier tilt that eats up the buffer tube and buffer retaining pin hole edges, and all that just so you can talk about how the oil on the bolt tail evaporated slower. Say what you want, but I know for a fact Di works, and works reliably and well. If you are too lazy to wipe the bolt and carrier off, I can't help you.

about a dozen ar's in the safes. All Di. None have ever had any issues traceable to the operating system except the car a3 lubed with rem oil and fired hundreds of rounds, maybe thousands. It had a failure to fully chamber, but that may have been also due to improperly resized cases. My dad was just getting into reloading and didn't full length resize some of them.

Why would it need that? Certainly not to keep functioning. That myth was put to bed long ago.

I never said it wouldn't have "oil-burn-off". I said it would keep going "bang" when you pulled the trigger 1000+ times between lubing it. I can find plenty of evidence to support that, too.

What kind of lube are you using? What DI and what Piston AR did you have? I have used rem-oil and fired more than 500 rounds without a re-lube, and that stuff is JUNK. Plenty of people have lubed once, and shot 1000+ rounds on it. I can link you to testimony after testimony of such. Pistons are a trade-off. More junk to break, less junk in the upper--unless you are suppressed, then variable DI is king.

I disagree. First, piston systems pre-date the M16/M4 platform in the M1A and M14 and AK-47. It's the DI that is "Modern", not the piston. Second, Pistons are dirty, too. They just spew the crap in a different place. Third, What "new trials" are you talking about? Link, please? Fourth, if you have ever shot suppressed with a properly gassed M4 (Noveske SB, purpose-drilled port, etc.) and then with a piston system, you will be able to appreciate the DI system. Piston guns, even in the "correct" setting have poor timing, as compared to a properly gassed DI system. The result is a DIRTIER chamber, etc. than the DI weapon due to the premature un-locking of the bolt and the back-wash of the gas into the chamber from the barrel as the suppressor has slowed the pressure drop. The only way you could appreciate this is by crunching a bunch of numbers...or actually shooting both and comparing them. Plenty of people have. They no-longer like suppressed piston guns as much. Since most of my shooting is going to be suppressed, I don't care how the weapon does unsuppressed nearly as much. You may very well feel differently. Fifth, user maintenance is more important than DI vs. Piston. Without cleaning, a proper DI system that has some lube shot onto the BCG every 5-600 rounds will run until the barrel is burned out. It's been proven time and again. 1500-2000 rounds for a carbine course without cleaning is common-place, and the guns keep running. Pat Rogers took it to an extreme with over 15,000 rounds and nothing more than more lube to keep it wet. Sixth. I can support all of my claims with personal testimony, data, testimony of others, etc. I respect your right to your own claims, but until you can support them, they do not have any weight in my opinion. DI vs. Piston Suppressed: http://www.ar15.com/forums/t_6_20/357626_Noveske_Switchblock____user_s_impression_experience_wanted.html&page=2 15,000+ rounds, and other testimony about other round-counts without cleaning: http://www.ar15.com/forums/t_1_5/943471_.html (The link to Pat Rogers is verified, the rest are hear-say) Piston=OLD, DI=New, well, I don't think I need a link to the cut-away and date of introduction of the M1A to prove the point.

Do you have any real experience, or just Youtube and Liveleak videos with 0 background story? You can post jamming AR's, I can post jamming AK's. What's your point?

You and nearly every other "gun guy" who ever served that I have met. If it were a POS, all my friends who came back from Afghanistan that actually saw action would not have bought or built one. Same for all the other guys we see on line, in person at the range, etc. Sukhoi, even your user-name suggests an affinity for Russian things, and that's fine. I admire their stuff, too. However, the efficacy of their weapons does not devalue by default ours. What is your PERSONAL experience, either performed, or witnessed by you, with the M4 platform? Further, how hard is it to maintain an AR? They don't need to be spotless clean, just well lubed. Every vehicle you see has 3-12 or more quarts of lubricant just waiting for you, should the need arise.

Fail to maintain any weapon/get a bunch of dirt in it, and it will give you problems in that environment. The soldier firing the platform is not very proficient with it. The mag is empty, he views it as a jam. He chambers a new round, and rides the CH home every time. Etc. At best, I would bet he can hit his targets to qualify, and knows to keep his booger-hook off the trigger until it's game-time. The rest of the actions he takes in the video certainly don't peg him as proficient at manipulating the weapon, and I am guessing his maintenance is not stellar, either. He has no understanding of the mechanics of a firearm it seems. Several times he looks at his M4 like he has never seen it before. Just watch the video and look on his face. It's like he's examining something from another planet in slack-jawed wonder. What do you expect his firearm to perform like? The truth is, after a massive survey was conducted, 89% of the troops are pleased with the M4 platform. The fact that 89% of a LARGE amount of enlisted agree on ANYTHING is a miracle in and of itself. As you have already noted, he had comrads around him--and they didn't have any problems that we know of. Wonder why? Another thing you might find interesting is the vast number of people who saw combat in Iraq/Afghanistan that own AR's stateside. If they felt the weapon sucked, why buy it now that they have a choice? They are the one's you are trying to say are having a problem with it, and they are the ones that keep buying them here. The logic isn't tracking. It's obvious you dislike the AR platform, but if you're going to attack it, use fact and data, not Youtube videos of some guy who barely understands which end the fast-moving thing comes out of (although the way he waves it around...) Anyway, two can play at the Youtube video game. Here is a guy in a nice, non-dusty, controlled environment, trying to enjoy his AK. http://www.liveleak.com/view?i=ec2_1222472051 Here is another unfortunate AK-47 user: http://www.liveleak.com/view?i=b1c_1311092968

Errr...I dunno. With slugs, it doesn't seem to matter much, and with the advent of "tactical buckshot" that has Flite Control wads, it makes the choke obsolete for buckshot. I bought an M590A1 a while back and at 40 paces (about 40 meters for me, as previously measured time and time again), it threw all 8 00 pellets into an evenly dispersed I have done a TON! of patterning with my M4's and have never duplicated those results. For tactical use, the choke is just "one more moving part". That said, all chokes perform differently. The MOD choke that came with your gun should be fine, and you might find a load it really likes. Then again, you could buy a MOD tube from Briley, and it will pattern buckshot totally differently than your OEM MOD choke--or it might not. I had an OEM Benelli IC choke that patterned buckshot VERY! tightly, and then an IC choke from Trulock that dispersed buckshot very well... Shotguns/chokes are voodoo. Play with it until you get it right. There is no formula with Buckshot it seems. Smaller shot is more predictable.

I sprayed CLP once, and never again. That one spray should prevent rust, etc. and it evaporates for the most part except a light film of the oil that remains behind after a month or two.

Brian Enos slide-glide on the trigger-group. Makes things nice. CLP will help, too. Nothing wrong with applying it. Trigger-feel in the M4, aside from the obvious surfaces that every trigger-group has, is a product of that little metal cylinder (you know it when you see it) and how it slides in the FCG assembly, as well as if the trigger-return spring is centered correctly and not grinding over the edge of the hole it lives in when the trigger is compressed.

If NFA paperwork was not taking 6 months door-door right now, I would do it. Sadly, I already have 1 NFA item in the pipeline and not enough self-control/patients as it is. FWIW, would you post price in this thread, or do you prefer not to? I'm not tire-kicking, so no need to PM me with price, just curious.

To be fair, I just used a regular punch and some common sense and was careful. The punch DID bend a good bit, so make sure it is sacrificial, but a special punch is not "mandatory". Just very helpful!

Get the anti-seize grease and tighten the **** out of it. Liberally greased, I have NEVER had an issue with getting it back out. Of course, don't blame me if you can't, I'm just offering my alternative as it worked well for me. *I have never measured the force I put on them, but I would guess around 20-30 lb-ft or so. They "pop" when I "break" them out for removal, if that makes sense. It shouldn't be anything insane, please don't take my advice to the extreme, just get it in there a lot better than you are now.

Only if you use no choke-tube grease/anti-seize and Benelli's crap wrench. Buy a Briley speed wrench and some choke-tube grease. It's well worth it and it fixes the problem.

Wear to the ejection port is normal and expected. It really seems like you are doing things "right" to me. My only advice really that is applicable to YOU is to lubricate the lifter assembly in the fire-control group. It sounds like this might be stiff. Check for binding with the trigger-group removed. FWIW, I broke my last 2 M4S90's in using 2.75 dram target loads and experienced zero failures. I know that is a VERY SMALL sample-size, but I also lubed them after removing all shipping lube carefully and checking for any binding/correcting it before heading out. The M4S90 is a very well designed platform, but some do take a couple hundred rounds of break-in based on what I have read of others experiences.

After playing with a lot of stuff, I think that the VERY LIGHTEST way that you can add a light, add a red-dot, and up the magazine capacity is the best way to go. To me, this means a light mount for an X300, a T1, Kip's rail, Kips Ti mag-tube, and a 3-gunnergear side-saddle velcroed/stuck on. After a few days at the range or walking around with it, you will like this SO MUCH more than some aftermarket huge rail, massive Surefire saddle, etc. etc. etc.

Normal. Pistons moving.

From what I remember, you need to use a thin punch and be prepared for it to bend in the process, also, it is an awkward setup (blind hole). You screw the end of that roll-pin up, it's staying in. Be smart with it. How many rounds/why are you replacing?

Sadly, it will do nothing to make your weapon any better, just legal with the 7-round mag tube in conjunction with the follower.

This is the one product that Kip buys complete from someone else. Geissele is responsible for the hammers 100%. Try giving them a call and asking, as Kip's delivery is at the mercy of their delivery on this product. Don't worry, Geissele is to the fire-control group what Kip is to the magazine tube.

I am looking friend in America and family has recommend you. In my country, guns like these one are very rare. I also, I cannot send all at once the payment. I have my cousin second in the Florida state. I want these Benelli collection m4. Can my brother you send it to and await in several months my downpayment for 400 lira that I am waiting on Arabian royalty who I helped with his financial problems based on his to me e-mail to come in. I will as soon as I have these monies then pay you your asking price many times over. But my cousin second is to be moving soon and must need these m4 by end of week next. Can make bargain to this?

\ Thanks! I am going to research it further since it will make/keep from my weapon going "bang" when I press the trigger.