cmadzela Posted September 6, 2019 Report Share Posted September 6, 2019 Good evening. First 1928... Have a 1970's 10XXA 1928 and when flipping between semi and full have experienced the bolt locking back... Is the locked bolt always a sign of weak disconnector? I have a movie of it happening on the line but can't attach it here. Thank you for the help! Link to comment Share on other sites More sharing options...
halftrack Posted September 6, 2019 Report Share Posted September 6, 2019 Can you be more specific? Thompsons are open bolt guns but I am sure this is not what you are referring to? Link to comment Share on other sites More sharing options...
cmadzela Posted September 6, 2019 Author Report Share Posted September 6, 2019 I was firing my gun fine a few trips to the range. I noticed the last trip when moving between semi and full I had the occasion where after a few bursts the bolt locked to the rear. The magazine was still full. I was able to apply enough pressure and finally release it. This last trip; I was trying to reproduce the conditions. I took a video but can't figure out how to add it here as "media"... Anyway, 30 round Seymour in the gun.... first few pops on semi - no problem. Switched to full and got off a few short burst and now (mag not empty) the bolt is locked to the rear. I cannot release the bolt. The trigger will not allow the bolt to come forward. I can't pull off the bottom group - just locked to the rear as tight as can be. Thank you Link to comment Share on other sites More sharing options...
bug Posted September 6, 2019 Report Share Posted September 6, 2019 Make damned sure chamber is empty. If no amount of manipulation will release the bolt, I believe you'll have to disassemble the fire control group in the lower. Link to comment Share on other sites More sharing options...
Motorcar Posted September 6, 2019 Report Share Posted September 6, 2019 Do a "Search" here for the bolt group being stuck to the rear, there is a thread on it here somewhere. If I remember correctly you do NOT want to pull the pivot pin out in this condition, it will make matters worse and possibly require cutting into the lower to release parts. That's what sticks in my head, might be wrong, do a search. Link to comment Share on other sites More sharing options...
halftrack Posted September 6, 2019 Report Share Posted September 6, 2019 I was firing my gun fine a few trips to the range. I noticed the last trip when moving between semi and full I had the occasion where after a few bursts the bolt locked to the rear. The magazine was still full. I was able to apply enough pressure and finally release it. This last trip; I was trying to reproduce the conditions. I took a video but can't figure out how to add it here as "media"... Anyway, 30 round Seymour in the gun.... first few pops on semi - no problem. Switched to full and got off a few short burst and now (mag not empty) the bolt is locked to the rear. I cannot release the bolt. The trigger will not allow the bolt to come forward. I can't pull off the bottom group - just locked to the rear as tight as can be. Thank youNow I understand the problem. Thanks! Link to comment Share on other sites More sharing options...
Colt Chopper Posted September 7, 2019 Report Share Posted September 7, 2019 Mine did that once, Tracie Hill helped me out. IIRC, MADE SURE THERE WERE NO LIVE ROUNDS IN THE CHAMBER. Removed the safety pin lever, using a small dental tool type pick with a small hook on the end, went thru the hole were the safety lever was, pulled down on the sear ( I think) an released the bolt. After removing the lower, completely disassembled, found a fired primer in the lower obstructing proper trigger operation. Cleaned thoroughly, reassembled, no more problems. Good Luck Link to comment Share on other sites More sharing options...
2ndArmored Posted September 7, 2019 Report Share Posted September 7, 2019 This link may prove helpful: http://www.machinegunboards.com/forums/index.php?showtopic=15571&hl=%2Bstuck+%2Bbolt Link to comment Share on other sites More sharing options...
robbo Posted September 8, 2019 Report Share Posted September 8, 2019 I had something very similar to this long ago on a westy 28. Don't remember exactly how I got it fixed but there was a small piece of debris caught up in the trigger mechanism. Was able to flush out with spray lube. Didn't have to remove any levers thank GOD. Link to comment Share on other sites More sharing options...
deerslayer Posted September 8, 2019 Report Share Posted September 8, 2019 Another small thing that can happen is the rear grip screw may protrude into the trigger group and cause problems... If the sear won't release through the safety hole you may try that too.. Turn out out a couple twists... If you get it apart look to see that it doesn't protrude inside the lower. Never remove the pivot plate. Safety yes.. As mentioned to lower the sear with a pick. But not the rocker pivot.. don't take that off either. Link to comment Share on other sites More sharing options...
cmadzela Posted September 8, 2019 Author Report Share Posted September 8, 2019 Thank you everyone! Link to comment Share on other sites More sharing options...
reconbob Posted September 10, 2019 Report Share Posted September 10, 2019 (edited) Another thing to consider is that the disconnector is ratcheting out fromunder the sear lever from the vibration of firing. Once the disconnector isno longer under the sear lever the sear snaps up and holds the bolt and whenyou pull the trigger nothing happens. The leg of the sear lever than engages the disconnector is supposed to beconcave and the top surface of the disconnector is convex so the parts nesttogether. If these surfaces are incorrect firing the gun will eventually cause it tojam as described. You can easily check this by field stripping the gun, take the trigger frame setto full auto and fire, hold the trigger back and while holding it strike the side of thetrigger frame 5-10 times with a non marring rawhide mallet. If the striking of the mallet releasesthe disconnector out from under the seat lever that is your problem. The fix is to replacethe sear lever, or disconnector, or both, checking that the mating surfaces are as describedabove . Bob Edited September 10, 2019 by reconbob Link to comment Share on other sites More sharing options...
Taliaferro Posted September 10, 2019 Report Share Posted September 10, 2019 Questions: Is your gun a West Hurley TSMG? Does it have a felt pad oiler in it? Link to comment Share on other sites More sharing options...
cmadzela Posted January 17, 2020 Author Report Share Posted January 17, 2020 Well. I appreciate the advice. That got me out of my issue. I replaced the disconnector spring; reassembled and then -- locked again. This time .. wiggling the trip helped me unlock it again. Seems that the sear isn't fully disappearing with trigger function. More springs! Thank you all that wrote in -- appreciate the support from the community. God bless America! Link to comment Share on other sites More sharing options...
jpw43 Posted January 17, 2020 Report Share Posted January 17, 2020 My Westie would lock to the rear and was hard as heck to get it to move forward again.The H lock channel had to be redone by PK. Now it never happens anymore. Link to comment Share on other sites More sharing options...
Bill in VA Posted January 17, 2020 Report Share Posted January 17, 2020 I’ve experienced the same problem, but both times it was due to debris (a primer) in the lower that kept the sear from fully depressing and thus not allowing the bolt to come forward. I determined the fault was mine for reusing brass too many times - primer pocket was too worn. Removing the pivot plate allowed everything to drop out of the way so the gun could be disassembled. Link to comment Share on other sites More sharing options...
2ndArmored Posted January 17, 2020 Report Share Posted January 17, 2020 I had a similar issue with an MP5 for the same reason. Little pieces can cause bigger problems. (Kinda like that little rock in your shoe...) Link to comment Share on other sites More sharing options...
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