I'm waiting on a tax stamp for a AAC 762 SND and I was wondering if anyone can tell me about the benefits (if any) of using the piston AR and a suppressor. I've heard that because of the extra gas in the barrel, the BCG gets just as dirty but will the shooter get less gas in the face with the piston?

Anyone run a suppressor with a LWRC M6-SL? The M6SL is what I have my eye on, but I just wish they offered it with a 12.5in barrel, something like a Kino (I don't like the rail system, perhaps a barrel change would fix it).

This is what I was thinking:

M6 SL

Pop that question on the L'dub forum. Lot of guys with can experience there.

On the LWRC forum several guys that have had problems running the Legacy M6 models suppressed. After 200 rounds the piston springs warp and the piston cups break. They say to run an M6 model suppressed regularly you need to swap out to a heavier buffer. But even then guys were reporting the same problem after switching out the buffers.

I have an M6SL with an AAC flashider, but I have decided not to run it with my ACC SDN-762 because of what I have read on the LWRC forum. I just run my 300BLK SBR with the can. Go search this on the LWRC forum on the LWRC website.

I have an LWRC UCIW with the updated gas system found on the SPR models. It seems a lot more robust than the M6 Legacy system. But my UCIW can't accommodate a suppressor because the rails screws are too close to the short barrel. So no experience there.

I did however just pick up one of the Adams Arms carbines from Bud's for $599. The gas block is adjustable for a suppressor. I put on an AAC flashider last week and ran 100 rounds suppressed through it on the suppressor setting. It was awesome. No fouling on the bolt or in the chamber. It was as clean as when I started. It even fouled the handguard less than when unsuppressed! AA did a great job tuning the gas system for a suppressor. LWRC not so much.


My $599 Adams Arms Carbine with upgrades: Magpul FDE furniture, Raptor Charging Handle, Geissele Trigger, AAC Flashider, Holosun Red Dot

No offense but it is easy to "tune" the gas system to a suppressor, when you throw an adjustable gas block onto it. You are the one tuning it, at that point.

Of course, but a manufacturer can easily do a mediocre job with the Gas Block and tune it poorly so you get a lot of fouling when suppressed. AA did a great job tuning their gas block for suppressor use.

Sometimes I wonder why I even run my SDN-6 on my Colt. It runs so much better on my LW. Smoother, more reliable, Less gas to the face etc etc.

Which model LWRC is that? Adjustable gas block right? Newer SPR gas system as well correct?

His looks to be the new IC model that LWRC released, judging by the full aimbi controls (bolt catch/release) on the side and the LWRC ambi charging handle.

Here is mine



Super smooth and runs like a champ suppressed. Mine doesn't have the adjustable gas block, just a self regulating system.

Since the M6-SL lacks the gas regulator, with and without the use of the AAC suppressor, the rifle would be just as reliable correct?

My rifle lacks a gas adjuster as well and it runs fine. Talk to modern outfitters, they can hook you up. They have some of the best customer service around.

I'm not so sure here is a big advantage in direct impingement vs gas piston suppressed.  I have a Stag Arms gas piston 5.56 and a Rock River .308 DI.  Suppressed, the crud just moves from on place to the other.  Both function reliably, just have to be cleaned more often.  Only aggravation worth speaking of is I do get a bit of crud in the mag with the DI suppressed that isn't their without the can.

Would you be able to cut down an IC-E or IC SPR to 12.5/12.7?

I’m seriously considering having this done, but I’m still wondering about the barrel heating up to quickly with the suppressor. I’ve been looking around for a medium contour barrel to replace the LWRC barrel, something like the Colt SOCOM but in a mid-length (which I can’t find), unfortunately FN or BCM doesn’t offer one. Perhaps the LW mid-length will be fine….
What would you would recommend?

I have a full factory 10.5" LWRC SBR that I purchased back in 2008 that I've run with an AAC M42K. It only has about 4K rounds through it and 90% of it was suppressed. Never once had a malfunction or any signs of abnormal wear on the piston. The reason that the round count is so low is due to the fact that I have/had about 20+ AR's and they all need some love ..I primarily shoot my 14.5" DI's and it's been that way for the past 4 years but, I still personally feel that LWRC"s are one of the best AR Piston rifles on the market.