I’m curious about pistons but am not overly eager to get one.
I’m more eager for the piston 556, then the piston AR15
Kevin
sweet pics, I especially enjoyed the before and after shots. Feel free to take more for us on this site who are not able to do that sort of thing on a semi regular basis.
Does any of the current makers of piston uppers offer a 6.8 version?
Just curious
Yes, The company formerly knows as LW makes a 6.8 version. From what Stephen from ATS has said, they have them in stock, on the shelf ready to ship.
Giff
They had a 10.3" 6.8mm SPC instock when I ordered it almost a month ago. It’s a really nice gun and performs exactly as advertised. Now that LWRC has gotten their household in order I’m expecting their piston system to be a big hit.
Stephen
PS Here’s my review on Lightfighter.net http://lightfighter.net/eve/forums/a/tpc/f/9046084761/m/2421007752?m=2421007752&a=tpc&s=7336015661&r=8451032852&f=9046084761&ORIGINAL_REFERRER_URL=http%3A%2F%2Flightfighter.net%2Feve%2Fubb.x%3Fcdra%3DY%26s%3D7336015661
The truth is (FOR ME) that I don’t “need” any AR, much less a GP. I don’t do anything more than punch holes in paper and hopefully will never have to shoot at another person.
I have two LW uppers (5.56 and 6.8) in 10.3 and 10.5" bbls. Unfortunately, I can’t shoot either yet (waiting on SBR paperwork). I ordered the first before this whole fiasco with PLW came to light and ordered the second after having extensive conversations with Darren as to his role…needless to say, my belief is that PLW has some serious character issues, but LWRC’s product is very nice. I also have to say that I believe Darren and Jesse of Grenadier Precision (now of LWRC) to be honest men and they’ve proven to me that they’ll keep their word. I ordered my second upper from them b/c of the quality of the first and the fact that I wanted to support guys I believed in.
I’m also probably a complete fool for being able to forgive PLW should he ever own up to what he’s done and apologize (he cost me $915 at one point, but that’s another story). Not to sound all preachy (I cuss like a sailor :eek: ), but “He who is free from sin, cast the first stone” is something I try to aspire to. EDIT (Yes, I realize that’s trying to try essentially…I’m not very good at it usually, LOL.)***
I’m also probably a fool for buying the gas piston hype as well as jumping on the 6.8 bandwagon. I guess I’m at least honest about it and “know thyself”. 
Once the paperwork is finalized, I’ll post a range report (if anyone cares).
Take care,
Sean
Sean,
I care, Im curious about the 6.8, not the Gas piston so much but the 6.8 is been getting to me…
As for the whole LWRC issue, well thats old news and it shouldnt cloud the boards anymore.
Hopefully you can get a range report up and running sooner then later right in this thread
Stephen – thanks for the link and the review.
Thanks Cold. I agree that LW is left to sink or swim now on their own merits…I just wanted to clarify why I would do business with them again in light of recent goings on there. Hopefully, I won’t be disappointed, but then again I did admit to being a fool, so take it FWIW. 
Sean
Yes, LW will sink or swim based on their new merits.
However, what sticks in my craw, is that all the lies, deceptions, and BS, that was spouted all over the internet on many different websites, still stands as it was, just waiting to ensnare new unsuspecting people who believe what they read, and don’t know about the “outing” on the “other website”.
This information, being left untouched, is still acting to sway people away from other good piston-operating products which have their own merits, and toward LW with PLW’s(aka HFG, CmdrColt, 3rdBurst) deceptions under the guise of an “official expert”.
I don’t think that’s good.
And allowing all that “known-BS” to remain in place, fully knowing that it is still out there deceiving people, is not a great start toward “coming clean”.
Good point but it doesn’t need to be expressed here…
Great point and I was suckered more than most. I don’t know this site’s policy about discussing the topic though so that’s all I should say (I already got locked at Arf.com for this very topic).
Hopefully, enough people will be able to get word to potential buyers that HFG, et all, can’t be trusted…but I have a feeling this is being overly optimistic.
Sean
After reading Stephen’s linked thread, I have a newbie question I posted on Lightfighter and figured I might as well post it here too:
Stephen (or anyone that can answer this newbie question):
You mentioned “bolt bounce” being the reason you needed to change out your friend’s buffer to an H buffer.
I also have an LWRC 10.3" 6.8 SPC SRT. I haven’t shot it yet b/c I’m also waiting on SBR paperwork for the lower (and the upper is being stored at a friend’s house).
I bought a complete lower LMT assembly for this upper. I have no idea what buffer comes with it and was wondering how you know you have bolt bounce (what is it exactly and how do you know it’s occuring)?
Also, what buffers are available and what are the differences between them? Do you generally have to replace the spring as well when you change a buffer or just the buffer?
Sorry for the newbie question…just want to get this thing running right when I finally get my paperwork approved.
Thanks,
Sean
Sean, I think LMT lowers come with an H buffer (don’t quote me on that though). You can also get an H2 or an H3. On top of that MGI and Enidine made hydraulic buffers.
At a minimum I would run an H and then try an H2 or a Hydraulic buffer to see what you get.
C4
Thanks C4 for the info. on the LMT. Can you explain what bolt bounce is and how I can tell if I’m getting it? Sorry for the newb question…I’m just not sure if I’d even know what the symptoms were.
TIA,
Sean
Sean,
I am not a piston expert so all I can say is that it is my understanding that a good many piston systems suffer from this problem.
C4
Okay…thanks for the reply and your patience with my questions.
Sean
Bolt bounce is exactly that. After firing as the bolt returns to lock-up with the receiver extension it bounces (it’s probably, technically, bolt carrier bounce). It doesn’t really cause any excessive wear as it is the same as letting the bolt group home when charging the weapon. It may become an issue during full auto fire or very fast semi auto fire as the weapon can cycle faster than the bolt bounce is allowing. You should be able to tell if you have bolt bounce right after you fire a round as you will feel a little bounce as the bolt seats home. It’s much harder to explain than to just feel it happening.
There are dozens of different bufers out there. Some of the most standard for a 5.56mm Carbine are;
-standard
-H
-H2
-H3
I can’t remember what the weights are off the top of my head, but they typically add about an ounce with each size increase. I run H’s or H2’s in all four of my carbines and a standard buffer in my mid-length.
HTH
Stephen
9mm buffer is 5.5 oz.
Rifle buffer is 5.2 oz.
H3 buffer is 5.6 oz.
H2 buffer is 4.6 oz.
H buffer is 3.8 oz.
Standard CAR 2.9 oz.
IIRC the Enidine buffer is roughly the same weight as the H buffer, it’s been awhile since I weighed one.
Just as a point of clarification, the MGI RRB buffer is a mechanical buffer, utilizing a short plunger and sliding tungsten weights and springs inside, weighing 7.1 ounces.
It is not hydraulic.
Regarding its use with various piston-operated uppers, it has been reported by users to be very effective with the POF system, and also reported even better when using the MGI 2x recoil spring in conjunction with the RRB buffer, in the POF system.
It has been reported by several users that the RRB does not give as effective results in the Leitner-Wise piston uppers, and is not recommended in the LW.
It is designed originally for direct-gas-impingment carbines, and works extremely well in that application. Recent comparison report by a customer stated that the RRB in a direct-impingement Colt carbine had “less kick” than a LW piston upper with an Enidine hydraulic buffer. This was posted by a user on the “other website”, in the LW industry forum.
All the buffers have their uses, and it is very much related to the gas port diameter of the individual weapon being used, and the buffer weight should be matched to the power of the gas system in that particular weapon.
Also, it should be noted that carbines especially will have changes(enlargement) in diameter of their gas ports over the lifetime of the barrel, due to port erosion. This can cause the need for buffer changes as barrel life progresses. The RRB has a “self-regulating” nature to the design, and will operate throughout the life of the barrel, and works better and better as it gets driven harder. The typical minimum sized carbine gas port needed to drive the MGI RRB buffer is .072" in most guns, but some guns might work with a slightly smaller port. Any smaller ports will eventually open up by themselves anyway, so the RRB could be then installed at a slightly later time in the barrel’s life, if it came drilled with a small port from the factory.
Regarding “bolt bounce”, this is eliminated when using the MGI RRB buffer, because the nature of its operation causes a secondary “hit” when the weights hit home right after bolt closure. Any attempt for the bolt to bounce is negated right there by that behavior.
Rate of fire is reduced by approximately 20%-25%, depending on the weapon involved. Muzzle climb is greatly reduced by the very effective cancellation of the slam of the rearward moving masses, by the forward moving internal weight system actuated by the plunger, just prior to bottoming out at the back end of the recoil stroke.