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Page AR-15 » AR Pistols
AR Sponsor: bravocompany
Posted: 2/12/2024 11:42:40 AM EDT
BLUF I don’t have a paid membership and search didn’t bring up any similar topics.
Say i had a 300 blk pistol upper, are there any existing pistol caliber conversions to fire cheaper ammo than 300 blk. Could such a thing be made or is the juice not worth the squeeze?
Link Posted: 2/12/2024 11:53:17 AM EDT
[#1]
The only common cartridges that might work would be 32ACP or 30 SC but they both use bullets .004 larger in diameter.  It would still probably work but I am not sure either of those would save you any money.  You just need to start reloading 300 BO
Link Posted: 2/12/2024 11:55:59 AM EDT
[#2]
The only adapters I'm aware of fire ammo that is MORE expensive than 300AAC.

I suggest buying a 22Lr upper.
Link Posted: 2/12/2024 11:56:01 AM EDT
[#3]
Just get a 9mm upper compatible with Endo mags so you can use the same lower
Link Posted: 2/12/2024 12:40:14 PM EDT
[#4]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mak0:
Just get a 9mm upper compatible with Endo mags so you can use the same lower
View Quote

This right here.
Link Posted: 2/12/2024 12:42:41 PM EDT
[#5]
Link Posted: 2/13/2024 12:56:50 AM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By mak0:
Just get a 9mm upper compatible with Endo mags so you can use the same lower
View Quote


Same can be said for 22LR, but cheaper to shoot 22LR
Link Posted: 4/1/2024 8:10:21 PM EDT
[Last Edit: az-gunner] [#7]
If you're not too attached to the 300BO, you could swap the barrel for 5.56
Ammo cost is similar but then you can run a cmmg 22 conversion kit.
Otherwise your next best bet is a 9mm upper with with magwell/block/mags of your preference.
Link Posted: 4/2/2024 9:05:35 AM EDT
[#8]
No adapter that I know off.  I had a PSA 10.5" 5.56 that I hated.  Dropped in a .22LR conversion kit, removed the gas block/tube and reinstalled a gas block backwards (to block the gas port). It is now the gun I shoot the most.  At some point will get a true .22LR upper, but for now, I shoot that since 300blk ammo isn't super cheap.
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