Quoted: Well all M16A2, A3, A4 & M4 rifles have a 1:7 twist. So that pretty much eliminates Bushmaster as "milspec".
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Bushmaster makes 1:7 barrels in several profiles if that's what you want. But, given that I don't shoot many M856 tracers, the 1:9 twist is an IMPROVEMENT over the 1:7 military twist rate.
Anyway, Colt is the only other AR manufacturer that's even in the running, and their ARs aren't anywhere near as close to Mil-Spec as a comparably-configured Bushmaster. Differences on current Colts:
- Pivot screw instead of push-pin
- Large-pin fire-control parts
- Plastic trapdoor in stock
- Plastic buffer (on some guns)
No other manufacturer is close; the main difference is the barrels. Only Colt and Bushmaster make Mil-Spec barrels.
-Troy