Gordon
Member
the difference in a 10.5 or better an 11.5" barrel and an (ugh) 7" is night and day ! Both in blast and performance. I bought a Noveske diplomat upper many years back when they first came out thinking how great it would be on my Calif Pistol registered Oly lower . It was too much even for me, with debris in the face from the then (before the flaming pig) muzzle attachments. When I chronographed it I remember why Remington went to the shortened .221 FIREBALL case in the 10" barreled XP100 and I was warned by Remington and the local gunsmiths not to rechamber to .223 (be cause I had unlimited free ammo in the reserves) in the middle 70s. I had turned the AR into a .22 Hornet basically. So I put a Colt 10.5" barrel on that diplomat upper and today , in Oregon and with a brace on a Noveske Lower , it is my favorite PDW . I picked up about 500 fps in 3 " longer barrel and yes it does have a Flaming Pig on it which tames the blast pretty well . FWIW 8" barrels do work ok with .300 BO , as minimal !
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