brownwood 11 Posted May 14, 2012 Report Share Posted May 14, 2012 I got a 410 today completing my Saiga collection of all calibers. I will do a basic conversion on it but dont like the long barrel. Any issues with bobbing it to 18.25? Anyone doen this? Quote Link to post Share on other sites
brownwood 11 Posted May 15, 2012 Author Report Share Posted May 15, 2012 Cycling issues is what Im concerned about. Quote Link to post Share on other sites
tatonic 159 Posted May 15, 2012 Report Share Posted May 15, 2012 I got a 410 today completing my Saiga collection of all calibers. I will do a basic conversion on it but dont like the long barrel. Any issues with bobbing it to 18.25? Anyone doen this? Congrats on obtaining all the saiga line. I would not cut the barrel, but thats me. Quote Link to post Share on other sites
dusobox 1 Posted May 15, 2012 Report Share Posted May 15, 2012 I've been studying on the idea myself because I have the 21.5 barrel. Can find the die to re-thread the barrel, but here is the problem I found. Miked the barrel, and it's about 2 or 3 thousandths larger than the threading dies tolerances. Given that I began looking for someone to turn down the barrel, well not a lot of calls out there to turn down a 410 barrel 5 or 6 thou's. I began devising (my hillbilly was coming out) ways to make a block clamp with a hole bored thru it that would hold silicon carbide sandpaper so I could wet sand a few thou of of the barrel to get within the threading die tolerances. Just don't have the stones to do it. My work shop is back up state, and I'm limited to hand tools here, and I'd be seriously ticked off if I ruined a perfectly good barrel to remove 3 inches! Now, if you don't want to re-thread it... they already come with a 19in. barrel, so I doubt 3/4 of an inch is going to change much in the cycling of the gun. If you intend to put a shroud on it like mine then 18+1/4 is too short because the shroud may interfere with the gas plug removal. You'll find the die and the TAT here: http://dinzagarms.com/tools/tkp.html or the die here: http://store.carolinashooterssupply.com/servlet/-strse-458/SAIGA-410-M20X.75-LH/Detail But turning that barrel down is the trick. Die tolerance is 0.591" to 0.611" (15mm to 15.5mm) o.d. barrels, and my barrel mikes out at 0.613"-0.614" (15.57mm - 15.6mm). I was also informed by the shroud maker that there might be a possibility of using a M16 X 1" die, but I don't think there is enough meat on the barrel for a 16mm die. I would think for a 16mm die I would need at least 16mm of barrel. Duh? A square cut is required, and then crowning the barrel is another issue also if your concerned with the spread and accuracy of your gun. If you find someone who can do the job let me know, and I'll throw some business his way. Quote Link to post Share on other sites
brownwood 11 Posted May 15, 2012 Author Report Share Posted May 15, 2012 I've been studying on the idea myself because I have the 21.5 barrel. Can find the die to re-thread the barrel, but here is the problem I found. Miked the barrel, and it's about 2 or 3 thousandths larger than the threading dies tolerances. Given that I began looking for someone to turn down the barrel, well not a lot of calls out there to turn down a 410 barrel 5 or 6 thou's. I began devising (my hillbilly was coming out) ways to make a block clamp with a hole bored thru it that would hold silicon carbide sandpaper so I could wet sand a few thou of of the barrel to get within the threading die tolerances. Just don't have the stones to do it. My work shop is back up state, and I'm limited to hand tools here, and I'd be seriously ticked off if I ruined a perfectly good barrel to remove 3 inches! Now, if you don't want to re-thread it... they already come with a 19in. barrel, so I doubt 3/4 of an inch is going to change much in the cycling of the gun. If you intend to put a shroud on it like mine then 18+1/4 is too short because the shroud may interfere with the gas plug removal. You'll find the die and the TAT here: http://dinzagarms.com/tools/tkp.html or the die here: http://store.carolin...0X.75-LH/Detail But turning that barrel down is the trick. Die tolerance is 0.591" to 0.611" (15mm to 15.5mm) o.d. barrels, and my barrel mikes out at 0.613"-0.614" (15.57mm - 15.6mm). I was also informed by the shroud maker that there might be a possibility of using a M16 X 1" die, but I don't think there is enough meat on the barrel for a 16mm die. I would think for a 16mm die I would need at least 16mm of barrel. Duh? A square cut is required, and then crowning the barrel is another issue also if your concerned with the spread and accuracy of your gun. If you find someone who can do the job let me know, and I'll throw some business his way. Thanks for the info! I wasn't going to rethread the barrel so I wasnt too concerned about diameter. Ive cut dozens of Mauser barrels down using a tubing cutter and hacksaw plus a little facing with great accuracy, so I figure a shotgun intended for 25 foot home defense would be easy. I have alsi decided to try the Kishnapup bullpup on this project as I am looking for the shortest gun possible. I will probably hold off on the barrel bob until I get the bullpup stock installed. Quote Link to post Share on other sites
G O B 3,516 Posted May 15, 2012 Report Share Posted May 15, 2012 Funny thing about metric threads: If you want to thread to 15MM and the stock is too large, but will go in a 16MM die, cut it with the 16MM die of the same thread pitch, and then re thread with the 15MM die. Quote Link to post Share on other sites
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