It is a cut down 16". All mid gas except for 11.5 Expo.
It is a cut down 16". All mid gas except for 11.5 Expo.
RLTW
Whats 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.
Looks like 12.5 is kind of a sweet spot for the heavier projectiles.
Sent from my iPhone using Tapatalk Pro
My 12.5 is my oldest barrel brand new being 18 and 16 with only a few sighters rounds through.
Velocity loss/gain per inch of change steepens under 12.5. It is moderate between 12.5 and 16, and fairly flat 16- 24 or so. As we look at medium length barrels like 13.5 or 14.5, an inch in either direction makes very little or no difference, but down in the 10.3 region, an inch can be a big change in noise, flash, trajectory/ballistics, reliability, and silencer wear. In the opposite extreme, there is almost no difference between an 18 and 20 barrel, in practical terms. As in, you really need a chrono to see the difference.
Handling difference between a 12.5 and 10.3 is nil.
In my view of general purpose rifles, which is merely my opinion, the sweet spots are:
11.5-14.5 for silencers (Mk18/M4 role),
12.5-18 for A2 flash hiders(M4/M16 role),
16-20 for light support weapons (M27/M38 roles).
Last edited by 1168; 04-22-24 at 08:29.
I thought I had a spare gas block to assemble the 13.5, but I dont. While we wait on that:
81*F
12.5 Hodge/Velos
Federal XM855
2819 fps
39 es
13.6 sd
12.5 BCM Kino/Turbo K
XM855
2825 fps
69 es
20.3 sd
12.5 Criterion Core/.264 MG7k
XM855
2824 fps
31 es
9.5 sd
69gr Norma .223
2620 fps
38 es
11.1 sd
RLTW
Whats 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.
Bookmarks