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Thread: 12 ga. to 45 AR Build

  1. #1
    Boolit Buddy
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    12 ga. to 45 AR Build

    I thought I would do a play by play on installing a 19 1/2" barrel liner inside a 31 1/2" shotgun barrel and chambered in 45 Auto Rim.

    I'm going to let the pictures speak for themselves, but if there are any questions, just ask!















  2. #2
    Boolit Buddy
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  6. #6
    Boolit Buddy
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    The finished product!

    The shotgun barrel will remain full length at 31 1/2", while the barrel liner was finished and crowned at 19 1/2".









    I'm thinking my next barrel liner will be in 327 Federal, but the more I look at a .17-38 or .17-357, I'm just not sure. Decisions, decisions, decisions.

    But then again, the way so many guys talk about the 25-20 or 32-20.......just too many choices!

  7. #7
    Boolit Buddy
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    Nice!

  8. #8
    Boolit Grand Master Texas by God's Avatar
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    I like that a lot! What is the report of firing it like? Also, what did you use to bond the barrel and bushings together? Where did you get the .451”(?) liner?
    AND I believe your scope will never, ever slip from the Auto Rim recoil......

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    Last edited by Texas by God; 03-21-2020 at 05:24 PM.

  9. #9
    Boolit Master roverboy's Avatar
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    Very nice. Please let us know how it shoots.
    Mrs. Hogwallop up and R-U-N-N-O-F-T.

  10. #10
    Boolit Buddy
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    Accuracy tests have to wait till it dries out and I can get to my range.

    Noise level is comparable to a suppressed 300 Blackout.

    I make my own barrel liners.

    Bushings are permanently attached to the barrel liner and then permanently attached inside the shotgun barrel.

    Not all trade secrets are revealed!

  11. #11
    Neat build, very good machine work but why not trim the sg bbl back to match the liner? Not like you need the bbl length for iron sights. Would be a lot handier. Curious how it would sound with the .452 bullet going through the oversized 12 ga bbl.

  12. #12
    Boolit Buddy
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    Thank you Baltimoreed!

    Me personally, I just like long barrels. Yes, it would be a little bit handier with a shorter barrel, but I am going to leave it full length until I get a chance to test it's accuracy, then if accuracy is now what I expect, I'll start cutting it back 2" at a time, checking accuracy after each cut and crown.

  13. #13
    Interesting experiment. Keep us informed. I usually like long bbled rifles but short bbled sgs and revolvers. I’ve got a 30 inch 1896 Krag and a 30 inch 1873 Winchester musket made in 1891 that are fun to shoot. It’s neat to shoot military guns that are that old.

  14. #14
    Boolit Master



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    Nice and should do quite well
    Mike
    NRA Benefactor 2004 USAF RET 1971-95

  15. #15
    Boolit Master flyingmonkey35's Avatar
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    Fantastic job

    Sent from my SM-G960U using Tapatalk

  16. #16
    Boolit Buddy
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    Thanks guys!

  17. #17
    Boolit Grand Master Texas by God's Avatar
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    Without the scope, what is the weight?
    Not only fantastic work; but Lots of GREAT PICS! Thanks for sharing. You were one of my "inspirators" when I built my 44-40 Topper stub!

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  18. #18
    Boolit Master

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    With a little extractor work it would do well with 45ACP. I did an H&R to 45 ACP a couple years back and it worked great. For those looking for liners try T.J.'s, they have liners from 17 cal. to 58 cal. TJsliners1992@gmail.com . I have been using their liners for over 20 years.

  19. #19
    Boolit Buddy
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    Quote Originally Posted by Texas by God View Post
    Without the scope, what is the weight?
    Not only fantastic work; but Lots of GREAT PICS! Thanks for sharing. You were one of my "inspirators" when I built my 44-40 Topper stub!

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    Thank you, I appreciate the compliments!

    Overall length is 47" with an exact weight of 7 pounds.

  20. #20
    Boolit Buddy
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    Quote Originally Posted by John Taylor View Post
    With a little extractor work it would do well with 45ACP. I did an H&R to 45 ACP a couple years back and it worked great. For those looking for liners try T.J.'s, they have liners from 17 cal. to 58 cal. TJsliners1992@gmail.com . I have been using their liners for over 20 years.
    No extractor work required! It will interchangably load, fire and extract the 45 acp and 45 Auto Rim with no modifications, because both cases are the same exact length and both cases headspace off the case mouth, even though the 45 Auto Rim naturally has a rim on it.

    TJ's 45 acp liners are .452 with mine and Larry's being .451 with cut rifling.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check