Old Bushmaster, Stag and a Frankengun, all 1 in 9. All shot 55gr sub moa.

JP springs and a set screw to remove some creep helps.

Non free float, two were xm177 style (heavy bbl under handguard,11.5 +5.5.
Both chrome lined.

None were pencil or M4. The other was a medium 16.

Last edited by hookeye; 06/08/20.