i have done it in 223. very inexpensive build before the shtf. you will have to use a poly or carbon lower. i had a plumcrazy complete lower with a red x arms pencil barreled carbine length upper that weighed right at 5.25lbs. a loaded mag and any kind of optics will push it up fast. i had 473.00 in that ar brand new.
Last edited by srwshooter; 01/11/13.
