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<blockquote data-quote="Bandit656" data-source="post: 2465152" data-attributes="member: 57074">Friend of mine brought me his 15-22 that he had attempted to remove the muzzlebrake from.&nbsp; Said something popped inside, now the barrel is loose and bolt won&#039;t close.&nbsp; Ok, the receiver is polymer and has two opposing grooves in it approx. 3 and 9 o&#039;clock position.&nbsp; The barrel and chamber are steel with what I&#039;ll call keys on either side to index into the polymer grooves.&nbsp; He had the receiver secured when attempting removal.&nbsp; Problem is that the polymer grooves will not sustain too much torque like that.&nbsp; It only damaged one side of the grooves and I was able to repair and reinstall barrel securely.&nbsp; I added my own modification to his barrel to prevent this in the future.&nbsp; <a href="http://s1181.photobucket.com/user/ruger656/media/IMG_15451_zps99287b38.jpg.html" target="_blank"><img src="https://www.okshooters.com/data/MetaMirrorCache/i1181.photobucket.com_albums_x430_ruger656_IMG_15451_zps99287b38.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>Milled wrenching flats on end of barrel just behind threaded end.&nbsp; Can&#039;t remember exact numbers but around .450 inch or the same as the top of the threads.&nbsp; A 13mm wrench fits perfectly.&nbsp; Now he can use wrench to hold barrel instead of receiver taking the torque.&nbsp; As he swaps muzzlebrake for a suppressor frequently he&#039;ll use this mod a bit.&nbsp; Then cerakoted barrel for him.Just use caution when removing your threaded attachments.&nbsp; Pretty sickening feeling he had.</blockquote>

[QUOTE="Bandit656, post: 2465152, member: 57074"] Friend of mine brought me his 15-22 that he had attempted to remove the muzzlebrake from. Said something popped inside, now the barrel is loose and bolt won't close. Ok, the receiver is polymer and has two opposing grooves in it approx. 3 and 9 o'clock position. The barrel and chamber are steel with what I'll call keys on either side to index into the polymer grooves. He had the receiver secured when attempting removal. Problem is that the polymer grooves will not sustain too much torque like that. It only damaged one side of the grooves and I was able to repair and reinstall barrel securely. I added my own modification to his barrel to prevent this in the future. [URL=http://s1181.photobucket.com/user/ruger656/media/IMG_15451_zps99287b38.jpg.html][IMG]https://www.okshooters.com/data/MetaMirrorCache/i1181.photobucket.com_albums_x430_ruger656_IMG_15451_zps99287b38.jpg[/IMG][/URL] Milled wrenching flats on end of barrel just behind threaded end. Can't remember exact numbers but around .450 inch or the same as the top of the threads. A 13mm wrench fits perfectly. Now he can use wrench to hold barrel instead of receiver taking the torque. As he swaps muzzlebrake for a suppressor frequently he'll use this mod a bit. Then cerakoted barrel for him. Just use caution when removing your threaded attachments. Pretty sickening feeling he had. [/QUOTE]

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