dakota.potts
New member
I was doing a little bit of reading on the Pedersen device yesterday and I started thinking. For those who don't know, the Pedersen is a device invented to turn bolt action rifles into semi-automatic rifles firing a pistol caliber round.
It seems that, in experimenting with chamber inserts, people were finding the .32 ACP pistol round to work better than other options like the 7.62 Tokarev, because the .32 fits the bore of the Mosin Nagant better than other pistol rounds.
It got me thinking, could you fashion a drop-in device that allowed you to fire .32 ACP rounds from the Mosin Nagant without manually cycling?
My thoughts are maybe using the parts from another firearm available on the market (like the Vz. 61 Scorpion). The scorpion is a blow-back operated .32 ACP submachine gun/pistol that feeds from 20 round magazines. This would allow you to use magazines that are already available on the market.
It seems like you could use the existing hammer and sear, and maybe even use the disconnector from the Vz. 61 parts. I imagine you would need a disconnector to keep from making a machine gun.
My thinking is you could machine a receiver that would hold the bolt carrier group, ejector, magwell, and extractor pieces. Utilize the right side bolt cutout on the receiver as the position for the magazine, and maybe you could tinker with ejection to make spent cases eject out of the top? In this way, you could avoid having to cut the receiver for extraction and keep the Mosin in its original condition. If necessary, you could also utilize a .32 ACP chamber insert instead of machining that into the device.
Am I wrong in thinking that is is not only possible, but not incredibly complicated? Treating the whole assembly like a pistol minus some of the more complicated parts (barrel, chamber, fire control group, etc.) it seems like you would only need a relatively small number of parts for a simple blowback system. You could cut down even further by sacrificing a bolt hold mechanism in favor of a simple system like that of the AK.
I have CAD and some minor skills that I may play around with to try to plot something out, but I'm not even sure where I would start on something like this.
As for why, really just for mechanical curiosity
It seems that, in experimenting with chamber inserts, people were finding the .32 ACP pistol round to work better than other options like the 7.62 Tokarev, because the .32 fits the bore of the Mosin Nagant better than other pistol rounds.
It got me thinking, could you fashion a drop-in device that allowed you to fire .32 ACP rounds from the Mosin Nagant without manually cycling?
My thoughts are maybe using the parts from another firearm available on the market (like the Vz. 61 Scorpion). The scorpion is a blow-back operated .32 ACP submachine gun/pistol that feeds from 20 round magazines. This would allow you to use magazines that are already available on the market.
It seems like you could use the existing hammer and sear, and maybe even use the disconnector from the Vz. 61 parts. I imagine you would need a disconnector to keep from making a machine gun.
My thinking is you could machine a receiver that would hold the bolt carrier group, ejector, magwell, and extractor pieces. Utilize the right side bolt cutout on the receiver as the position for the magazine, and maybe you could tinker with ejection to make spent cases eject out of the top? In this way, you could avoid having to cut the receiver for extraction and keep the Mosin in its original condition. If necessary, you could also utilize a .32 ACP chamber insert instead of machining that into the device.
Am I wrong in thinking that is is not only possible, but not incredibly complicated? Treating the whole assembly like a pistol minus some of the more complicated parts (barrel, chamber, fire control group, etc.) it seems like you would only need a relatively small number of parts for a simple blowback system. You could cut down even further by sacrificing a bolt hold mechanism in favor of a simple system like that of the AK.
I have CAD and some minor skills that I may play around with to try to plot something out, but I'm not even sure where I would start on something like this.
As for why, really just for mechanical curiosity