Reviews & Ratings for FN America Ar15 Barrel 10.5inch Bb M16 5.56 Carbine — 2 reviews — Page 1

The 10.5 inch barrel for so many such a beloved barrel size its basically the shortest length you can go and still run a carbine length gas system, which is why in mid 2000s Socom decided to use it. 16 inch barrel can get in the way, adding a surpressor to a 14.5 inch barrel is too long for cqb and not easily riden around in 4 runners, humV. Just about every 10.5 inch barrel ive shot was gasy Reason the gas hole is slightly enlarged possibly .125 or the same diameter as the tube. Ehy did they do this couole reasons. The first is so thst ut can run full auto with a surpressor. If you had a tiny little gas hole you can bet theres gonna be too much back pressure gas tube is gonna over heat the barrel then over heats as well, gun stops working when that happens in my experience. Ive seen someone run a pistol length gas system on a 16 in barrel. It worked in semi but in binary it over heated quickly you need more dwell time you need a slightly bigger gas hole as well like on the 10.5 mark 18. The other reason is so they can run any ammo and chew through it. Doesn't matter if its under powered ammo it will fire and cycle. My first 10.5 inch barrel I immediately just put in a standard spring and buffer and it ejected at 2oclock and i felt more kick then i normally do. So i decided to get the Geissele super 42 spring with the H2 buffer and then it ejected at 3. The braided spring and heavier buffer slowed down the bolt just enough for it to flick that shell out exactly where i wan...
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Great barrel but the gas hole was way too small. Normally i can fit a tooth pick in the gas hole, on this barrel you can barely fit a needle. It wasnt allowing enough exhast to push the bolt back.. I had no choice but to send it back.