quliming Posted December 10, 2018 Share Posted December 10, 2018 Bought this used, it's probably over 10 years old. It's set up for limited, but upon gauging, it doesn't fit, by just a little. Seems the basepad is dawson. Took it apart, it has the grams follower. Does anybody know who made the tube? It has no inscription on it. How would I be able to fix this to make it fit? Quote Link to post Share on other sites
jcc7x7 Posted December 10, 2018 Share Posted December 10, 2018 If it says SNL on the side of the basepad that means "sometimes not legal" You'll need to get a regular dawson base pad or sometimes referred to as +1 pad TTI 4mm usually will work also, may need a slight amount of filing to the rear of the feed lips to clear the gauge. All my Dawson +1 fit without any filing a few of my TTI 4mm pads had to be filed on the back of the feed lips to clear the gauge. When you gauge lay the gauge horizontal and just lay the mag in it. No pressure on the pad at all. Both set-ups hold 20 easily reloadable with either old SVI tubes or old gen1 STI mags Don't know about the gen2 STI mags Good fortune Quote Link to post Share on other sites
wgj3 Posted December 10, 2018 Share Posted December 10, 2018 Should be an "old-style" SV tube. They are good stuff! As previous poster mentioned, there are multiple means or dwaling with this issue: 1- Different basepad that is a tiny bit shorter 2- Removing material (small amount) from rear of feed lips, where they are contacting the guage 3- Removing a little material from bottom of basepad Quote Link to post Share on other sites
HI5-O Posted December 10, 2018 Share Posted December 10, 2018 Looks like the old SV tube. Swap out the base pad. Find friends with different base pads and borrow to see which one will fit. Quote Link to post Share on other sites
Jfitz427 Posted December 10, 2018 Share Posted December 10, 2018 Can you show the ofher side of the tube with the control rib? It might be an sps tube. Like others have said you can do one of two things, put a different basepad on it, or file a bit of the rear of the feedlips, which is probably what I would do. Quote Link to post Share on other sites
mont1120 Posted December 10, 2018 Share Posted December 10, 2018 My good friend had the same issue with .40 cal tubes for his Rock Island 2011. He had to file off some metal on the basepad to get them to fit. Quote Link to post Share on other sites
Posvar Posted December 10, 2018 Share Posted December 10, 2018 Filing a bit off of the base pad is easy and only costs a little bit of time. I had to do it to a few of mine. Matt Quote Link to post Share on other sites
Postal Bob Posted December 10, 2018 Share Posted December 10, 2018 Like previously mentioned, if the basepad says SNL, that is the reason. Also, if you have grip tape on the bottom, that will cause it to not fit the gauge. Quote Link to post Share on other sites
pskys2 Posted December 10, 2018 Share Posted December 10, 2018 Could be an SPC tube, the only one I had was soft and wouldn't retain the proper feed lip width. How many rounds? My SNL's get 20, reloadable. You can take a small amount off of the bottom back corner and the SNL's will sometimes fit. Don't put any kind of tape on the back half of the base pad either. As long as you don't weaken it you can file the lips down a shade and the base pad a shade to make it fit. Looks about like my STI/Dawson SNL pad/tube fit was before I started "whittlin" on it. Now they both fit just fine. Quote Link to post Share on other sites
quliming Posted December 11, 2018 Author Share Posted December 11, 2018 The basepad does not have any inscription like "SNL" on it. Called dawson, measure the basepad height, comes to 0.825, according to dawson, that's +1, SNL will measure about 0.885. Measured the tube alone, overall back length is 128.5mm. I am not confident to file the tube by myself. Anyone has any idea which basepad will make this legal. Anyone can identify these tubes? Quote Link to post Share on other sites
quliming Posted December 11, 2018 Author Share Posted December 11, 2018 All three mags can hold 20 rounds, and it's reloadable. The spring has 11 coils, not sure what spring it is. Quote Link to post Share on other sites
muncie21 Posted December 11, 2018 Share Posted December 11, 2018 That looks to be an older SV mag. Here's a pic of mine with a Taran 4g. They also make a 3g if you want a bit more cushion. Quote Link to post Share on other sites
quliming Posted December 11, 2018 Author Share Posted December 11, 2018 Hmmm, I think we are getting close. I measured my new SV mags tube only, and it's 145mm. This tube measures 135mm. Now I am not sure if those base pads are dawson. Quote Link to post Share on other sites
muncie21 Posted December 11, 2018 Share Posted December 11, 2018 I'd find a buddy that has 3g or 4g TTIs (Taran) or spend $30 and buy one to test. Pretty sure that will fix the gauge issue. Quote Link to post Share on other sites
APL-G35 Posted December 11, 2018 Share Posted December 11, 2018 I’d try the taran pads too, plus they are easier to take on and off for maintenance. Quote Link to post Share on other sites
anbrumm Posted December 11, 2018 Share Posted December 11, 2018 I'd recommend filing the feed lips a little or try a thinner basepad like the Taran Tacticals. Quote Link to post Share on other sites
Trini Posted December 13, 2018 Share Posted December 13, 2018 I have several SV 126mm tubes that I use Grams base pads and they fit the gauge. Have older CPMI base pads that do not fit. Quote Link to post Share on other sites
Will_M Posted December 13, 2018 Share Posted December 13, 2018 On 12/11/2018 at 1:05 PM, anbrumm said: I'd recommend filing the feed lips a little or try a thinner basepad like the Taran Tacticals. I wouldn't touch the feed lips on a $100+ no-longer-available, highly desirable mag tube when the solution is readily available for $30. Quote Link to post Share on other sites
anbrumm Posted December 13, 2018 Share Posted December 13, 2018 14 minutes ago, Will_M said: I wouldn't touch the feed lips on a $100+ no-longer-available, highly desirable mag tube when the solution is readily available for $30. Which is why I suggested the other basepads as well. Quote Link to post Share on other sites
quliming Posted December 14, 2018 Author Share Posted December 14, 2018 Thank you guys for the help. SV confirmed this is their old style mag. I also contacted Grams and Beven said his 11mm basepad will work. If I decide to sell these at some point, how much is this worth? Quote Link to post Share on other sites
Will_M Posted December 14, 2018 Share Posted December 14, 2018 47 minutes ago, quliming said: Thank you guys for the help. SV confirmed this is their old style mag. I also contacted Grams and Beven said his 11mm basepad will work. If I decide to sell these at some point, how much is this worth? Check the Classifieds. SV old style mag with Grams guts is worth about $120-$150. Quote Link to post Share on other sites
muncie21 Posted December 14, 2018 Share Posted December 14, 2018 (edited) 4 hours ago, quliming said: If I decide to sell these at some point, how much is this worth? Value could very, depending upon them fitting in the mag block or not Edited December 14, 2018 by muncie21 Quote Link to post Share on other sites
A.J. Stuart Posted December 18, 2018 Share Posted December 18, 2018 Qu, If you want to try some different basepads and see what fits. Let me know. I can meet you at LP. I have tons off miscellaneous basepads laying around. Quote Link to post Share on other sites
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