eric nielsen Posted October 29, 2013 Share Posted October 29, 2013 Like the title says the new top end on my STI open gun has a noticeble "bump" in the last 1/4" of forward travel on its way to locking up. This is with no ammo, no mag, even. May have caused a few malfunctions this week that I thought were ammo issues (crimp or rough 38 Super case rims). Thinking this might be due to a barrel link that is just a little too long? Maybe the link holes have stretched as the new parts have worn in? Looking for gunsmith opinions, thanks. Link to comment Share on other sites More sharing options...
StraightUp_OG Posted October 29, 2013 Share Posted October 29, 2013 Custom built or STI factory? How many rounds through it? Link to comment Share on other sites More sharing options...
al503 Posted October 29, 2013 Share Posted October 29, 2013 Could be the barrel lugs on the slide stop. Link to comment Share on other sites More sharing options...
practical_man Posted October 30, 2013 Share Posted October 30, 2013 Are there burrs on the barrel locking lugs? Other deformation on the top side of barrel? Is the barrel binding on the bushing where it should be relieved for unlocking? just a couple of things to check. Link to comment Share on other sites More sharing options...
Service Desk Posted October 30, 2013 Share Posted October 30, 2013 Could be a nice tight lockup in need of oil..... I noticed that it was a new top end. Link to comment Share on other sites More sharing options...
Toolguy Posted October 30, 2013 Share Posted October 30, 2013 The hood might be a tiny bit too long. Link to comment Share on other sites More sharing options...
DWFAN Posted October 31, 2013 Share Posted October 31, 2013 (edited) Hood, upper or lower lugs. Or it could just be a nice tight fit that needs shot. Edited October 31, 2013 by DWFAN Link to comment Share on other sites More sharing options...
eric nielsen Posted October 31, 2013 Author Share Posted October 31, 2013 (edited) I think al503 got it. Cleaned the barrel really well and noticed wear on the bottom lug that rides the slide stop on either side of the link. Link was peened in place too well to remove/replace it before the Tues nite match so I tried my 2 spare slide stops. The new one that has not been shot has a bigger OD and is perfectly round, it seemed to make the bumping worse, like a scraping sensation. The older spare seemed to make the problem go away at least for now. I put plenty of oil around every reciprocating part, no Slide Glide (yet) as the gun seems to object to that after dirtying up with 400-600 rounds, it shot w/zero problems at the nite match. All this makes me think I need a slightly longer link and some more new slide stops. Edited October 31, 2013 by eric nielsen Link to comment Share on other sites More sharing options...
Tripod Posted November 9, 2013 Share Posted November 9, 2013 I call it the barrel bump. Al503 is right if I was placing $$ on it Link to comment Share on other sites More sharing options...
nmcferro Posted November 12, 2013 Share Posted November 12, 2013 I had this exact same thing happen to me recently when I put a new slide stop in my Edge. I was afraid to shoot it, and tried a different new slide stop that ended up working just fine. I measured the OD of the old to new slide stop, with the new being 0.03 of an inch wider, Link to comment Share on other sites More sharing options...
jrb06 Posted November 12, 2013 Share Posted November 12, 2013 Check for bent link pin you may not think a pin that small will bend but it can. pound it out and look at it. Link to comment Share on other sites More sharing options...
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