sly279 wrote:
5.56 in 16" above does ok, the shorter the barrel gets the worse the gas system gets. the 300 black out i designed for short barrels. as for 308. I have seen too many videos and read to many reviews of jamming and failures to feed on a lot of the cheaper ones. the ar gas system wasn't designed for 308.
? The issues with short barreled AR?s is the reduced distance from the gas port to the muzzle which reduces the gas volume. That can be crutched by an enlarged gas port, a longer gas tube (a ?pig tail? gas tube wraps around the barrel once increasing volume a little), and I believe they have different buffers to compensate for short barreled AR?s. They can and are typically made to work reliably. I don?t care for the idea of an AR barrel much under 16? because of the reduced velocity takes too much of the sting out of the .223 round. Without that high velocity the little 55 or 62 grain bullet doesn't have so much going for it.
? I?d just go with a 7.62X39mm upper and forget that .300 Blackout. Ballistically both are close enough to call it good.
? Actually, the original Armalite AR-10 in the 1950?s was in .308 and it used DGIS. The only thing before that I?m aware of was the WW2 era Swedish AG-42b and that does not blow the gas
all the way back into the bolt carrier like the AR does. I haven?t deep dived into it but I?ve never heard anything particularly negative about the AR-10 and they are still being made. Without doing considerable research I wouldn?t sweat it. If I wanted another .308 semi-auto with the intent of scoping it I?d get a recent version of the AR-10.
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if i every win money i'll get a scar, but at 3k i would sooner get a tar21 at 1,800. but if i had the money and was getting a 308 simi auto it would be scar17 ,m14, fal, then g3.
? The Tavor looks cool but I can?t see myself getting one in the foreseeable future. A friend of mine just bought one and when our schedules both allow it he?s going to let me try it. The thing that keeps me (and others) with the AR platform is all the accessories and modifications that can be done with it.
? If you want to get a .308 semi-auto and scope it the AR-10 seems to be the best since you?ll have a picatinny upper to start with. The FAL has that goofy gas system that could be as much of a pain in the ass (I have one) as an asset. The M14 / M1A is starting to show it?s age as a design. After all, it?s an updated version of a 1930?s design that still retains a lot of the 1930?s features. As much as I love the M-1 and M-14 I don't think they would be my choice if I could have only one .30 caliber rifle to do everything. The HK-91 (had one) is as sturdy as a fencepost, decent scope mounting (claw mount) and very reliable, but not very ergonomic. The barrel (about 17? I think) is a bit too shor to take advantage of the 308?s full potential.
Just my 2 cents worth?.
My 2 cents. 9.25 to one twist .308 win. 180 gr+ for the shock. 1920's sporterized spanish mauser. Over under scope, with no rattling noisey rifle strap. Excellent hunter.