romano Posted November 24, 2008 Report Share Posted November 24, 2008 Hello guys, I am now in the first transfer of a West Hurley 1928 TSM gun. It just came to my Class III dealer today. The gun is great and it is in the lower 800 serial #s. The thing that gets me is that the lower trigger housing is very tight on the upper receiver. It took a little to pull the 2 apart. Is this normal on the West hurleys to be so tight ? I know on the parts sets I have and also other thompsons that I have taken apart have not had this problem. Also is it a good idea to swap the upper internals for savgae parts ? To run a 100 round drum ( new model that I have) will I have to do any work to this (gun or drum )? I have heard mixed info on the 100 round and 50 round drums. Any info would help greatly. best Regards Romano Link to comment Share on other sites More sharing options...
1921A Posted November 25, 2008 Report Share Posted November 25, 2008 Hi Romano, welcome to the boards and the NFA world. The WH 1928 should not require any special effort to remove the trigger frame from the receiver. Did you follow the disassembly procedure described in the manual? 1921a Link to comment Share on other sites More sharing options...
reconbob Posted November 25, 2008 Report Share Posted November 25, 2008 I think most people would expect the trigger housing on a WH to be loose. If yours is tight that is good. For a perfect fit get some very fine polishing or grinding paste - should have only the slightest feel of grit when you rub some between your thumb and finger. If it feels like sand its way too coarse. Apply the compound to the rails of the trigger frame then slide the frame on and off the receiver. At first it will probably get stuck 1/2 way on, but as you work it it will go on more and more until it goes on all the way. Give it a few more cycles, then remove and clean the paste off, oil the rails with a light oil and you will have a perfect fit like glass. The paste will not really affect the finish at all other than where the rails rub each other. Bob Link to comment Share on other sites More sharing options...
romano Posted November 25, 2008 Author Report Share Posted November 25, 2008 yes I did, I took the lower and tried it on a few dummy receivers and they fit a little looser. Is there any fix grinding etc to just make it slide a little better. This is pretty tight fit. My class III dealer as had many thompsons in his possesion and he has never seen it this tight. best Romano Hi Romano, welcome to the boards and the NFA world. The WH 1928 should not require any special effort to remove the trigger frame from the receiver. Did you follow the disassembly procedure described in the manual? 1921a Link to comment Share on other sites More sharing options...
romano Posted November 25, 2008 Author Report Share Posted November 25, 2008 Hello Bob, thank you very much on the info. Thats great I will try it. best Romano I think most people would expect the trigger housing on a WH to be loose. If yours is tight that is good. For a perfect fit get some very fine polishing or grinding paste - should have only the slightest feel of grit when you rub some between your thumb and finger. If it feels like sand its way too coarse. Apply the compound to the rails of the trigger frame then slide the frame on and off the receiver. At first it will probably get stuck 1/2 way on, but as you work it it will go on more and more until it goes on all the way. Give it a few more cycles, then remove and clean the paste off, oil the rails with a light oil and you will have a perfect fit like glass. The paste will not really affect the finish at all other than where the rails rub each other. Bob Link to comment Share on other sites More sharing options...
hrt4me Posted November 25, 2008 Report Share Posted November 25, 2008 Send your WH 1928 TSMG to PK for a lifetime of peace of mind and risk-free function. Link to comment Share on other sites More sharing options...
PK. Posted November 25, 2008 Report Share Posted November 25, 2008 Do not abrade or remove any metal from your receiver/frame interface. Some WH guns have bowed receivers that will make the fit tight (very tight sometimes). This condition will cause the bolt cavity to be excessively wide. If you remove metal, you may achieve a good frame/ receiver fit, but you will be stuck with an oversize bolt cavity. It is most likely that you need to have your receiver straightened to the print dimensions, which will cure both problems simultaneously. Link to comment Share on other sites More sharing options...
shadycon Posted November 25, 2008 Report Share Posted November 25, 2008 My suggestion was going to be,measure everything and check for anything out of spec. before doing any modifications. Find out EXACTLY what is causing problem before trying to fix it. PK's answer is 100% in my book. Link to comment Share on other sites More sharing options...
romano Posted November 25, 2008 Author Report Share Posted November 25, 2008 Thank you PK for the info. I will not touch it. Thanks for the speedy service on the buffer parts etc. My client loved the parts and fast service. Thanks to all best Romano Do not abrade or remove any metal from your receiver/frame interface. Some WH guns have bowed receivers that will make the fit tight (very tight sometimes). This condition will cause the bolt cavity to be excessively wide. If you remove metal, you may achieve a good frame/ receiver fit, but you will be stuck with an oversize bolt cavity. It is most likely that you need to have your receiver straightened to the print dimensions, which will cure both problems simultaneously. Link to comment Share on other sites More sharing options...
TM76 Posted November 25, 2008 Report Share Posted November 25, 2008 Romano My WH also had a bow in it , I had to use a nylon block and a hammer to slide it out, I sent it to PK for compleat overhaul of my 28. It came back like a new Thompson and I don't know how he did it ,but the bow was gone , it slides out just like my 21 thompson does. I have had my 28 WH about thirty years ( $550.00 ) and it served me well. I didn't have lot of the problems like some of the people on this form had. I just thought it was PK time for my tommy. Send it to him, you will be satisfide see ya Tino Link to comment Share on other sites More sharing options...
reconbob Posted November 25, 2008 Report Share Posted November 25, 2008 (edited) In defense of my suggestion, my experience has been that if a frame slides all the way on, but is very tight, that between 0.0005" and 0.001" is all it takes to get it right. I do not believe that 0.0005" (one half of one thousanth of an inch) is going to significantly change for the worse any other defect the gun may have. The total vertical tolerance between the groove on the receiver (0.1275 + 0.003) and the tongue on the trigger frame (0.123 - 0.003) can be as much as 0.010 (ten thousanths of an inch). The tolerance for the width of the same tongue and groove is 1.545 - 0.01 for the receiver and 1.55 + 0.01 for the corresponding recess in the trigger frame for a total horizontal tolerance of as much as 0.025 (twenty five thousanths of an inch). Thats a lot, and I don't think I've ever encountered original Thompson parts that were that loose. However, the slight amount of material that would be removed using my process is insignificant and well within the listed tolerances. I agree with PK that excessive removal of material is a bad thing, however, I do not believe the process I described goes that far. Bob Edited November 25, 2008 by reconbob Link to comment Share on other sites More sharing options...
drdave2441 Posted November 28, 2008 Report Share Posted November 28, 2008 My WH was so tight, I had to use a rubber mallet to get the two apart. However, a trip to PK has solved everything. The receiver might be out of alignment because of the rolling of the lettering on each side of the receiver. PK knows how to inspect and check to see if everything is true. My WH is now just as good if not better than a Colt. It is beautiful. Link to comment Share on other sites More sharing options...
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