pump-action .45 ACP carbine

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That got me thinking. If a guy had a lathe it would be neat to convert a .410 pump shotgun to shoot 45 acp or 45 colt. 45 colt would probably just take modification to the lifter to make it feed and stubbing on a rifled barrel.
 
I own an Auto Ordnance 1927A1 and if they could get a pump to be a accurate & dependable as this
Tommy Gun, they would be onto something. They would have to reduce the weight from what this
beast is of course.
However for myself I don't see there being a market for such a carbine in a pump action.
The only way they could be, onto something, is if it had a dual purpose or gimmick of some kind
to go along with it sort of like -someguy2800- implied. Or maybe even an optional drum & now I
am in make believe, sorry.
 
I’m right there too, I would love to see it happen but don’t expect it to. A 410 conversion may be the easiest, but I’m personally looking at building a 10mm AR with a pump action upper receiver. An AFG or a vertical grip on the pump would make it really quick and handy. AR would be easy enough to block off, and a 6.8 mag would probably feed well enough.
 
A Mechtech conversion would be suboptimal.

The Mechtech is a direct blowback. It doesn't lock. The only thing holding the bolt closed is a spring. The only real solution would be to install a spring so strong that it would prevent semiautomatic function, and then connect the bolt to a pump forend somehow. However, you'd probably get tired of shooting it after a single magazine.

Otherwise, you'd need to design and machine some kind of locking mechanism, which isn't much less work than just building a whole new gun.

I think you'd be better off modifying something that's already a pump action.

Or, there is such a thing as pump action AR15's. And there is such a thing as .45 acp AR15's. You might be able to kludge together some pump AR parts and a direct impingement .45 upper. But that sounds like a real pain.
 
I’m right there too, I would love to see it happen but don’t expect it to. A 410 conversion may be the easiest, but I’m personally looking at building a 10mm AR with a pump action upper receiver. An AFG or a vertical grip on the pump would make it really quick and handy. AR would be easy enough to block off, and a 6.8 mag would probably feed well enough.

Does somebody make a locked breech 10mm bolt and barrel? You would need to have a locked breach, not blowback, otherwise the pump will come flying back under recoil.
 
Individual state restrictions do not make for an attractive market for a new design.
Maybe for AWB III.

Ruger had a line of lever actions no doubt meant for an AWB II economy. But AWB did not get extended so it was a flop.
 
Does somebody make a locked breech 10mm bolt and barrel? You would need to have a locked breach, not blowback, otherwise the pump will come flying back under recoil.
6.8 bolt should work. It’s not listed as 40/10mm but should lock up. I will cycle an empty 10mm through my 6.8 when I get a chance just to check function.
 
I’d hesitate to convert a .410 pump shotgun only because the pressures for a shotgun are much less than for a .45 ACP round at 21,0000 psi. Black powder pressure .45 Colt loads are similar (12,000 psi or thereabouts) but other .45 Colt ammo gets up in pressure quickly!

Stick to slugs in .410 and you’ll be fine :).
 
Most .410s are on the same frame as 20 gauge so even though the pressure of a .45 would be higher, applied over a smaller area would keep the bolt thrust down. If you still worry about it, round up a Savage 170 .30-30 pump to convert.
 
If they make an AR to fit it, converting it to a pump is pretty simple. Start with a free float tube, slot it on top then add a sleeve on the outside that hooks to a rod. Replace the gas tube with that rod and affix it to the gas key. This works with locked breech, not sure about blowback. You would be holding the bolt closed along with the spring and bolt mass, so it probably would legally still be a semi.

Not sure if there is a locked breech round that uses the same case head that fits in the AR15. So you may need to start with an AR10 if you want a 45.
 
A 450 bushmaster bolt would fit a 45 acp case head. They all use an ‘06 rim dimension. I don’t think you would get a short 45 acp to feed through the barrel extension though. The pistol ar barrels start the chamber where the locking lugs normally are.
 
6.8 mag will work with the extra space blocked off and a modified follower. Pump action uppers exist and are expensive. The receiver extension seems like the biggest obstacle. I don’t know how hard that would be to do. I have never pulled one off of a barrel.
 
I should note I have no interest at all in this, I was just trying to help work out a solution. The company I linked is supposed to make a direct impingement 10mm upper, so they should be able to make the barrel and just not drill the gas port. I think theirs uses Glock mags with a 45 acp lower.
 
Henry already makes a pump action 22 -and I wouldn't be surprised to find out that there were a few pump action designs years ago for larger calibers that might form the basis of a new .45 pump action, since they seem to like restoring older style rifles to the modern market. An Israeli firm did have a pump action 357 in the not so distant past ( I remember seeing one or two for sale over the years so it is do-able). Don't think they sold very many of them though... A big bore pistol cartridge pump action carbine would definitely be worth a look if someone reputable came up with one... in my opinion.
 
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