RedNeck Jim had a barrel chopped to 4.5 but if memory serves he had nothing but trouble with it.
I'm sure others will jump in with more info on that topic though. He did run a pretty good thread on it as I recall.
Mine is down to 12.5 inch which is the UK legal limit. but looking back some of the US guys have them much shorter than that.
That said I'm not sure mine would qualify as SBR by US standards. It it's pretty good as I see it. Would post a pic but as yet don't have one on this phone.
Rob
Mine is 4.5" but I needed to remove material from the bolt group like S&W did for their pistols. They chopped the barrel to 6". I also bobbed the hammer.
My SBR will run fine with subs, standard and HV ammo.
Pistol
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Pistol and rifle
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Now I'm wondering if 4.5 inch is too short for reliability? For those who have it, will it run without modifying the bolt?
I have a 4.5in , most ammo runs fine and cycles, standard vel and HV work fine.
subs will not, anything less than 1000fps will not fully cycle the bolt, but will shoot.