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Old January 8, 2019, 10:11 AM   #13
Senior Member
Join Date: January 2, 2005
Location: Where the deer and the antelope roam.
Posts: 2,442
Last year I built an AR pistol in 40 S&W, why 40 you ask.... Logistics. I had some teething pains to make it reliable with all ammo. It fed FMJ and HST's great but did not like truncated cone HP's. I installed a feed ramp for Taccom3G and then built up the ramp with JB weld, basically making a ramped barrel. If I had a machine shop I would machine one from Stainless. It will now feed empty brass.

The 8.5" BBL gets the 155 grn HST up to 1360fps. From what I understand the 9mm is very similar, past 8.5" velocity gains are SLOW.
Retired Law Enforcement
U. S. Army Veteran
My rifle and pistol are tools, I am the weapon.
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