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I just put the A5 receiver, H4 buffer and Sprinco green in my 14.5" BCM middy.
Not life changing, but better than the standard carbine buffer that came with my lower.
I'm not. If you keep it lubed, the system will run some crazy heavy buffers.
My BCM 14.5" middy ran with one of Slash's XH buffers and a Springco blue spring. The buffer weighed 8.2oz. And i wasn't even using an lmt E-carrier.
I just polished the proper areas of a normal bcg. Ran 100% even with Tula and pmc.
It just wasn't as smooth as an A5 system. Nothing else is.
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"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
"The body cannot go where the mind has not already been."
Ok I need this laid out for me. Ideal setup would be the heaviest buffer that your gun will run on whatever ammo you prefer?
Sic semper tyrannis.
Myself I would use the heaviest the gun runs on the weakest ammo I may have laying around. To me a gun that barely runs something like .223 pressure UMC, does fine on 5.56 M193, but won't run Herters is not acceptable. Just depends on your use of the gun and how versatile you want it to be.
I'm not the guy that will sacrifice perceived "smoothness" for a less versatile, less reliable gun. I'd take a 16" carbine that eats anything over a 14.5" mid with a heavy buffer that needs the best ammo available to function.
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Last edited by tylerw02; 03-13-14 at 11:50.
"You people have too much time on your hands." - scottryan
This thread has been worth it's weight for me personally, thank you to all those who have made some quality contributions. I have in addition read the various threads in the NFA section as well as the "Ideal Suppressed Rifle" thread; I am still left with a few specific questions that I am hoping some here might clear up for me.
I recently received my tax stamp for an SBR lower that up until now had been used in a pistol configuration, I have a factory MK18 upper and a factory Noveske 12.5" that share the lower. When in pistol form, I was using an H2 buffer and never experienced any malfunctions or failures to lock back upon empty; ejection seemed to be at a fairly consistent 4 o'clock.
I have now installed the A5 system onto the lower and am using the standard VLTOR spring and buffer, after my first range trip yesterday I still have yet to experience any malfunctions whatsoever. I don't put a ton of weight into ejection patterns, but the rifle does seem to be a bit snappy while ejecting basically to 3 o'clock. Add to that when I add my relatively new AAC Mini 4 - ejection actually occurs to the 1-2 o'clock. Ammunition used was PMC Bronze, XM193, some Wolf and 64 grain Gold Dots. Again no failures, but I am wondering if I should go up a bit in buffer weights or even use a space LMT enhanced carrier and bolt I have laying around (I don't see a lot of recommendations for the bolt, why?).
Thanks in advance for your assistance.
Just my data point...
Colt 6920LE
16" Colt carbine gas length barrel, M4 profile
LMT enhanced carrier+enhanced bolt
Vltor A5 RE (short rail)+Vltor A5H4 buffer+Sprinco Green action spring
Griffin Armament M4SDII comp
Geissele SSA-E trigger
I went down this path looking to take some of the "jump" away from the 16" carbine after shooting my 18" mid-length gas upper. The carbine was almost
over caffeinated compared to the nicer manners of the 18" upper.
Results->
The Colt 6920LE is now a completely different animal. Little to no harshness. A word used a lot to how it handles is "smooth". I would have to agree. Second, third and forth shots very fast and on target. Where the improvement really shows is shooting on the move. The dot moves much less.
Very happy with this upgrade to the Colt 6920LE carbine.
I liked it so much, I picked up another lower (Colt 6920SP) to give the 18" mid length upper a home.
Rainier Arms Select MedCon 18" barrel
Another A5 RE (7 hole)+Green Sprinco+A5H4
A1 flash hider
Geissele SSA-E
Colt BCG
This upper is much more outside temperature sensitive with the heavy A5H4 buffer. I use Lake City xm193, IMI, and xm193 PPU almost exclusively.
With cold temperatures <32*, I started to see short stroking, bolt failure to hold back. I made a A5H3 from a std A5H2 and a donor tungsten weight from a H carbine buffer. The H3 in cold weather worked in a cleaned gun, lubed with Fireclean. Shot as cold as -6* F w/o issues. 400 rounds tells me this works. I plan to swap back to the A5H4 once the weather breaks and see what happens. Stay tuned.
The 18" mid length saw a dramatic example, to me, of how buffer weight affects reliability. My range bag now has an A5H2 and A2H4 in it.
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