CMMG - An AR-15 for a first timer?

1:7 is the best all-around rifling twist for an AR. It can shoot heavy bullets for better long range performance and will also shoot the common 55 grain bullets accurately.

The only drawback is that it can overspin some 40-45 grain varmint type bullets, causing them to blow up before they reach the target, but I think this is a moot point, since you can't legally hunt varmints with an AR and 55 grain FMJ makes for the least expensive plinking ammo.
 
tjhaile said:
1:7 is the best all-around rifling twist for an AR. It can shoot heavy bullets for better long range performance and will also shoot the common 55 grain bullets accurately.

The only drawback is that it can overspin some 40-45 grain varmint type bullets, causing them to blow up before they reach the target, but I think this is a moot point, since you can't legally hunt varmints with an AR and 55 grain FMJ makes for the least expensive plinking ammo.
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Are you actually shooting more 65gr or heavier bullets than anything else? Most of the guys I talk to are shooting what they can buy in bulk at a reasonable price or else there not shooting much at all.
 
evan the cdn said:
Are you actually shooting more 65gr or heavier bullets than anything else? Most of the guys I talk to are shooting what they can buy in bulk at a reasonable price or else there not shooting much at all.
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1:9 will certainly work for most people, but I think that 1:7 is more versatile; it does not give up the ability to shoot 55 grain bullets, which are probably the most common and inexpensive bullets used in .223, with good accuracy, yet it also has the ability to shoot heavy bullets of up to 80 grains.

The average AR shooter doesn't really need a 1:7 barrel, but, at the same time I don't think they are really giving anything up by having one, either.

More discussion here:
http://www.m4carbine.net/showthread.php?t=11829
http://www.m4carbine.net/showthread.php?t=7053&highlight=twist+rate
http://www.m4carbine.net/showthread.php?t=7900&highlight=twist+rate
 
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