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Posted: 2/2/2021 6:09:46 PM EDT
Link Posted: 2/2/2021 9:19:25 PM EDT
Difficulty of obtaining ammo would have been enough to make me choose something else.
Link Posted: 2/2/2021 9:38:46 PM EDT
Link Posted: 2/3/2021 1:31:33 AM EDT
So you just use the PF45 frame and get a .50 GI conversion upper?  I was looking into doing a 10mm build, just cuz.  This project sounds interesting, so send us pics when it's done!
Link Posted: 2/3/2021 9:16:51 AM EDT
Link Posted: 2/7/2021 4:25:05 PM EDT
You can also go with a PF45 frame and build into 45 super. IIRC you can get an adapter barrel to convert to 10mm too. Can't remember but there might be a 460 Rowland conversion too.
Link Posted: 2/7/2021 5:10:20 PM EDT
Link Posted: 2/7/2021 5:33:51 PM EDT
Link Posted: 2/7/2021 6:33:37 PM EDT
Link Posted: 2/7/2021 11:50:16 PM EDT
If you haven't already ordered parts to finish the lower, make sure that you get the correct Gen 4 G21/SF trigger housing. The Gen 3 will not work without heavy modifications and it is also too short and will rock on the trigger housing pin.

Gen 3 on top of a Gen 4 housing                                                                                    Modded Gen 3 on top

Attachment Attached File
Attachment Attached File

As you can see there is quite a bit of difference between the Gen 3 and Gen 4 trigger housings. And the Gen 4 G21/SF trigger housing will still need a slight modification to sit in the frame correctly.

Marine Gun Builder has a good  (but long) video on how to fit the Gen 4 housing into the PF45 frame.

Link Posted: 2/8/2021 12:31:23 PM EDT
Link Posted: 2/8/2021 12:53:58 PM EDT
[Last Edit: 2/8/2021 12:59:49 PM EDT by PursuitSS]
Link Posted: 2/8/2021 12:55:43 PM EDT
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Originally Posted By PursuitSS:

I haven't order the lower parts yet.
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You will be better off trying to buy all OEM parts individually. Unfortunately most places are out of stock. I looked at all my go to vendors for the Gen 4 trigger housing and everyone is out.
Link Posted: 2/8/2021 1:15:33 PM EDT
Link Posted: 2/8/2021 2:21:26 PM EDT
That should leave a bit of a wound channel.
Link Posted: 2/8/2021 6:49:10 PM EDT
Good lord that's a cannon.
Link Posted: 2/8/2021 9:53:08 PM EDT
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