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#1666661 - 08/17/20 01:32 PM .45 AR pistol issues
magchange Offline
Addicted

Registered: 04/03/16
Posts: 561
Loc: VA - Virginia
City or County: woodbridge
Maybe an expert or 2 can help here.My son built a 45 7" pistol that fails to feed and eject every other round basically.the spring /buffer is a 45 cal and it's not a magazine or Ammo issue all have been tried.The lower is Wolfpack armory and upper is delta team tactical.If this thing ever gets fixed it will be a cool little weapon but just a heartbreaker for him now.The thing I can't get past is no feed ramp?.is that normal for a sub gun?Feel free to chime in-thanks

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#1666783 - 08/17/20 09:21 PM Re: .45 AR pistol issues [Re: magchange]
LaserJock Offline
B * L * U * E

Registered: 11/21/08
Posts: 5452
Loc: NoVA 22192
City or County: NoVA 22192
Blowback?

You need a small chamfer on the chamber face

I've used 1 inch diameter grinding stones chucked into a drill. Final polish wrapped the stone first with 80grit then 120grit then 220grit and finally in steel wool

Pic stolen from the web. Mine was more of a radius rather than flat


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#1667784 - 08/21/20 11:15 PM Re: .45 AR pistol issues [Re: magchange]
Builder_Zee Offline
Pea shooter

Registered: 12/12/18
Posts: 2
Loc: VA
City or County: Stafford
Sounds like a neat little build. The failure to eject leads me to suspect a timing issue. A direct blowback build will, by necessity, need a higher buffer weight. Recommended weight is 10 ounces; you can use either an adjustable weight buffer or fixed weight as offer by Kaw Valley Precision.

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#1667785 - 08/21/20 11:16 PM Re: .45 AR pistol issues [Re: magchange]
Builder_Zee Offline
Pea shooter

Registered: 12/12/18
Posts: 2
Loc: VA
City or County: Stafford
Sounds like a neat little build. The failure to eject leads me to suspect a timing issue. A direct blowback build will, by necessity, need a higher buffer weight. Recommended weight is 10 ounces; you can use either an adjustable weight buffer or fixed weight as offer by Kaw Valley Precision.

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#1668091 - 08/22/20 11:23 PM Re: .45 AR pistol issues [Re: Builder_Zee]
magchange Offline
Addicted

Registered: 04/03/16
Posts: 561
Loc: VA - Virginia
City or County: woodbridge
Thanks for the input guys .He took it to Middletown firearms out in Winchester to save time.They discovered issue with the trigger pack and a burr in the lower i think.My son said the gun went full auto on the guy with a extended glock mag.They replaced trigger pack and couple things for $200 and contacted ATF i believe to see if anyone else has a possible automatic weapon.Live and learn-haha

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#1668100 - 08/22/20 11:55 PM Re: .45 AR pistol issues [Re: magchange]
Newgunguy Offline
Bolt action

Registered: 06/06/17
Posts: 174
Loc: Virginia
City or County: Glen Allen
My 9mm upper from Davidson Defense also didnt have a feed ramp and I was having all kinds of issues with the projectiles being rammed down into the cases. My problem was the mags and it runs fine with a Joe Bob's Spartan lower for Glock mags.

Charles.

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#1669598 - 08/28/20 11:38 PM Re: .45 AR pistol issues [Re: Newgunguy]
magchange Offline
Addicted

Registered: 04/03/16
Posts: 561
Loc: VA - Virginia
City or County: woodbridge
Thanks for that info he actually is still encountering that same issue.Wasting .45 ammo testing it is driving him nuts.Not sure what route he's going to go.I told him don't get Korean/sgm mags stick with oem glock but live and learn.Hes going back to the gun shop since he already paid them hopefully they figure it out...ugh

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#1670579 - 09/01/20 07:30 PM Re: .45 AR pistol issues [Re: magchange]
LaserJock Offline
B * L * U * E

Registered: 11/21/08
Posts: 5452
Loc: NoVA 22192
City or County: NoVA 22192

Ran about 25 to 50 rds of ball ammo thru CMMG radial delayed blowback 8" barrel and bolt combo. Upper, rail charge handle etc was just a spare leftovers set of parts. No sights, no muzzle device laugh 1 minor hiccup in the beginning

Bolt locks back on the mag follower

Quarter Circle 10 lower

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