I have for a while been wanting to do a blow back rifle. the price of kits have gottten ski high and by the time you spend $200 for a AK kit and possably another $75 for a sunomi kit to rob the barrel and mag out of its not hardley worth it.
After thinking about it and looking at the 22 LR Ak trunions and parts I was starting to think why not just build my own trunions and other parts and skip the whole need for a AK kit???
A front trunion is only a block of steel to hold the barrel. now I would plan on getting a little more creative with it and have possably milled in scope rails ect. A blow back really dosent need a gas tube, piston, gas block doing nothing so why not git rid of the weight. this would also allow you to get the sights or scope closer to the barrel. ( draw back of the AK IMOA). the trunion could have extra deep larger OD rivet/ screw holes to eleminate any issues with the screw builds are no good people. this would make assembly really easie also would make a take down build really simple as well. It would be USA made as well
THE reciver can still be a normal AK/tapco shell or I have seen the wones made for the Sunomi mag well. It would hold a original AK FGC. every one has non USA FGC,s laying around an there cheap if you dont.
the rails could be made heavier/more solid and act as a better guide for the now missing gas piston, as I plan on doing away with the factory carrier as well.
The carrier could still be an original but with prices going up. I would make my own. Its really just another block of steel with a hole in it to hold the bolt and some groves to fit the new above mentioned heavier rails. add a charging handel and weld or pin in a original bolt (the one part I havent figured out how to build easly) they are still resonably cheap and avaliable. the custom carrier could be made in differant weights or have provisions for adjuting the weight for tuning it to a certain calibur. It would be USA made
the Bolt would have to be original. possably have the rail groves opend up or not. I have no firm idea in my headon how to make one from scratch or a cheaper alternitve. Im open for sugestions and also looking for a AK .22 LR bolt as well to examine and use in a possable 17 hmr build. If any one has one or knows of the avalibilty Im looking???????. I was thinking of a original bolt just placed it a hole of a custom carrer and possably pined,bolted or welded in place.
THE REAR TRUNION and recoil spring could be original. they are getting harder to find and to be honest Id like to get the sights down lower so I was thinking of a just a block of steel again made to hold a a stock and a place for a spring and possably a GUIDE ROD through the spring going through the carrer to the front trunion. this way the carrrier would not need the whole spring pocket and be possably easier to make. It seems to me the spring could be about 1/2" lower allowing a lowere dust cover and lowere sight plane.
DUST COVER could simply stock on a original carrer, reartrunion build, OR a simple sheet metal channel made from scratch on a brake. I see after market dust covers with scope rails cheap from time to time and they are still avalible original cheap but prices keep going up.
BARREL sources are now almost without limit as the front trunon is no longer restricted to a 22 or 23 MM OD. Any sunomi, Iuzie,pistol , bare blank, there are hundreds of take of rifle barrels ect out there. questionable sleeves would not be needed with a custom trunion. Im suprised some one hasent made a blow back after market trunion already.
MAGS. sky is the limit., there are already pre made sunomi mag well an would be a good choice for a 9mm, there are 1911 45 auto drums avalible (american made as well). Im sitting on a few Sunomi kits so I will be doing a 9mm at some point with a drum. I also like the Rugger 10-22 mags for a possable .22 LR build (cheap and US made). I would find away to make a trigger guard as the originals are drying up as well.
STOCKS, PISTOL GRIPS, ECT. with the reduction of American made parts and loss of the gas piston almost any stock grip combo will work.
I am mainly thinking out loud here. and hoping to hear constructive ideas. The custom front trunion makes the most sence to me, and would be easy to make on a mill and not impossable to make from 1 1/4" solid on just a drill press.
WHAT ARE THE LIMITS OF CALIBURS/ PRESSURES IN A BLOW BACK???? 45 AUTO ?? CAN A 357 0R 44 45 AUTO MAG BE DONE??