I just bought a 300 blk pistol upper from MAS defense. When you order from them you can pick and choose what parts you want (kinda). You can choose rail length and style. Muzzle device and so forth. Build your lower. That part is stupid easy. Buy a completed upper you won’t miss anything by not building you upper. You’ll save yourself money by not having to buy all the tools it takes to put one together.
If you’re unsure about a part or build step don’t be afraid to ask on here.


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