want to build a 40 carbine

[andywoj]

Need some info / advice. If I were to purchase a .40 barrel and bolt from quarter circle 10, and a magwell adapter from RRA, and installed these parts into a standard ar15 upper and 80% lower, do you think this set up will function? I'm not sure how proprietary these parts are, so I don't want to order and it not work. I like quartercircle's twist rate on their barrels, and want to use my 80% lower that I milled out. Any info is greatly appreciated

[andywoj]

Anyone? Anything?

[batman4706]

Most pistol caliber ARs have a feed ramp pinned in them for the 9MM or 40 S&W, I don't know abut using a magazine connecter. Mine is a DDLES (now Quarter Circle 10) small Glock lower. I have a 40 S&W and 9MM upper for it. My 40 barrel was from DDLES and my 9MM is from ADCO. Rudy at Macon Armory builds lots of pistol caliber ARs and is always glad to help.

[usmcvet]

Have you called QC10? I bet they would help. There is lots of good info on their web site.

[andywoj]

Have you called QC10? I bet they would help. There is lots of good info on their web site.

I haven't actually called them, but I've been to their site and looked at their parts. Last time I checked they were out of .40 bolts but had the barrel I was interested in. I also posted something at macon armory, but haven't heard back from them at all. The search is still on....... I think my biggest concern is finding the right magwell insert that will work with something other than RRA magazines et al. If I could find a mawell insert that I could use with my 80% lower, and all the particular parts that go with it that would work with Glock magazines, then I would be more confident in ordering parts from QC 10 for a build.

[usmcvet]

This looks interesting.

https://newfrontierarmory.com/shop/c...ck-style-mags/

[andywoj]

This looks interesting.

https://newfrontierarmory.com/shop/c...ck-style-mags/

Indeed. Emailed them to see if they're going to sell this in an anodized version. Also asked if there's a possibility of them manufacturing an insertable block for a std AR15 lower that takes Glock et al mags.

ETA: can get the receiver anodized via special order for additional $5, takes about 3-4 weeks. My cost on one of these would be $142 shipped.
Regarding mag blocks, quote from the company "We prefer not to make blocks for AR receivers, but instead make dedicated receivers like our C-9. We do have future plans to offer a .40 and .45, just no timeframe right now."

[usmcvet]

Indeed. Emailed them to see if they're going to sell this in an anodized version. Also asked if there's a possibility of them manufacturing an insertable block for a std AR15 lower that takes Glock et al mags.

ETA: can get the receiver anodized via special order for additional $5, takes about 3-4 weeks. My cost on one of these would be $142 shipped.
Regarding mag blocks, quote from the company "We prefer not to make blocks for AR receivers, but instead make dedicated receivers like our C-9. We do have future plans to offer a .40 and .45, just no timeframe right now."

Good news the extra $5 is probably worth it. Will you treat the rest of the gun after you finish it?

[andywoj]

Good news the extra $5 is probably worth it. Will you treat the rest of the gun after you finish it?

No probably not. I already have a mil spec butt stock assembly, and will piece this together with parts from QC 10 and others. May take a while to do it. I usually try to keep things stock for the most part. First step is to clear the purchase of the lower with my loan department (wife) and we'll see where it goes from there.

[artoter]

No probably not. I already have a mil spec butt stock assembly, and will piece this together with parts from QC 10 and others. May take a while to do it. I usually try to keep things stock for the most part. First step is to clear the purchase of the lower with my loan department (wife) and we'll see where it goes from there.

Yeah, getting the approval from the wife is always a tough hurdle.