16" carbine 300blk, std gas block, FA bcg, no brake, std ammo (not subs).
Shoulder getting a bit beat up after 25rnds, mule kicking.
For a 1st adjust, should I try a heavier buffer or a heavier spring?
|
||||||||||||||||||||||||||||||||||||||
Member
16" carbine 300blk, std gas block, FA bcg, no brake, std ammo (not subs).
Shoulder getting a bit beat up after 25rnds, mule kicking.
For a 1st adjust, should I try a heavier buffer or a heavier spring?
Last edited by DwayneZ; 01-27-21 at 15:13.
Senior Member
Which buffer and spring are you using now?
Member
Brownells
078-000-337WB AR-15 Carbine Buffer 3oz (modifiable weight capable)
100-028-014WB Luth-AR BS10A AR-15 223 Carbine Buffer Spring
Perhaps the AR-308 carbine spring is the right choice?
Site Sponsor
What barrel?
RLTW
“What’s New” button, but without GD: https://www.m4carbine.net/search.php...new&exclude=60 , courtesy of ST911.
Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.
Member
Green Mtn 16" GM-M27
Last edited by DwayneZ; 01-27-21 at 15:05.
Senior Member
I would start by trying an H2 or H3 buffer or the equivalent buffer weights. That is close to the original buffer mass the gas system was designed for.
Senior Member
You are spitting out two to three times as much bullet weight with supersonic 300 BLK, it’s going to kick more than a 5.56 carbine.
A regular carbine spring and H or H2 buffer should be correct.
Member
I gonna switch in some tungsten weights for H3, and then back down from there if needed.
But yes, I do expect more kick from 300, but not this much. This 300blk runs good, now just doing some fine tuning.
Senior Member
I feel very little reduction in recoil when I compare a carbine buffer to an H1, or an H1 to an H2.
The addition of a brake should provide more reduction.
Member
I would think that changing buffer weights will NOT change the felt recoil that much, if at all.
Yes, the bolt speed will slow down with a heavier buffer. But if you think about it, a heavier buffer would be more weight moving slower, a lighter buffer would be less weight moving faster. Tit for tat = the same felt recoil to the shooter. The bolt has to cycle.
Additionally, realize the buffer and recoil spring will receive their full cycle command through the BCG from expanding gas during the dwell time. You cannot change the dwell time without changing the barrel length. But you can alter the dwell time’s effect with an adjustable gas block or muzzle device.
I would start with a brake to reduce felt recoil. Double up on ear pro
Last edited by matemike; 01-27-21 at 22:44.
“Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
- Mark Twain
Posting Permissions
Reply With Quote
Bookmarks