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Old 02-17-2014, 04:41 PM   #11
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Quote:
Originally Posted by bluez View Post
Anytime you ahve a billet lower you are doing well
not always...

billet just means its milled out of a block of aluminum which is first cast into the block. forged means it was cast into the shape skipping the machining part.

with aluminum there is no structural difference in metals of the same grade when it comes to carving out of a block of aluminum or pouring into a mold.

what IS important is, is the lower made to milspec tolerances or better??

in a upper, if your machinists are very good and using new or very good condition cutting tools you can get very close tolerances from carving out of a billet of aluminum. this matters for uppers, for lowers long as it meets milspec it doesnt matter. all the accuracy of a AR15 is in the upper.
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Old 02-17-2014, 05:37 PM   #12
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JonM makes an excellent point. As long as the lower is milspec where it needs to be (I.E. accept milspec lower parts and fit well with standard uppers and magazines) then forged or billet will do. So there's no requirement to go billet unless you want other niceties such as different styling, a flared magwell, no roll pins, custom trigger guard, special engraving, a screw to remove upper/lower slop, etc. Again, niceties but not necessary. QD does milspec and niceties as well as anyone so I couldn't resist their US Army Edition, especially since Quentin is my middle name.

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Old 02-17-2014, 09:59 PM   #13
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one other point i forgot to put in there.

companies like rra are forged lowers but you will have a DAMN hard time finding a tighter fitting closer tolerence lower than the basic RRA lower. i use their lowers in most of my rifles. i have one colt one bcm lower the wife has a bcm lower as i bought hers complete. the rra lowers blow the colt and bcm away for fitment.

just because its forged doesnt mean loose. just because its billet doesnt mean tight fitment. it boils down to how the final fitting and machine work are done.

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