Silverscooby27 Posted April 29, 2018 Share Posted April 29, 2018 I have a Sig P320RX that I was Considering using for carry optics. I was looking at basepads and noted that Sig already makes a 21 rd magazine ready to go. That seems to be the easiest route for me. Does anyone know if the mag is legal for carry optic (140mm) and does it work OK with a standard full size P320RX? Link to comment Share on other sites More sharing options...
Explosiveo Posted April 29, 2018 Share Posted April 29, 2018 Yes. Its legal and works fine. But if you get the 17 round mags and the springer precision basepads you can fit 22-23 rounds. Little more expensive but thats what I am planning to do. Link to comment Share on other sites More sharing options...
Silverscooby27 Posted April 29, 2018 Author Share Posted April 29, 2018 Hmm...good to know. Does the Springer offer the highest capacity? Are there other options for basepads to consider? Thanks!! Link to comment Share on other sites More sharing options...
z40acp Posted April 29, 2018 Share Posted April 29, 2018 If you have 21 rounders, use the Springer base pad and grams follower/ spring. They hold 23 reloadable also. Link to comment Share on other sites More sharing options...
bossgvr4 Posted April 30, 2018 Share Posted April 30, 2018 TTI and Taylor Freelance have +capactiy basepads as well. Link to comment Share on other sites More sharing options...
rocket99 Posted April 30, 2018 Share Posted April 30, 2018 14 hours ago, z40acp said: If you have 21 rounders, use the Springer base pad and grams follower/ spring. They hold 23 reloadable also. This is what I use for carry optics Link to comment Share on other sites More sharing options...
ddc Posted April 30, 2018 Share Posted April 30, 2018 I don't have a 140mm guage but I was under the impression that the stock 21 rounders with the stock base pads are a hair too long to fit. You either need aftermarket pads or grind down the stock ones a tad bit. Link to comment Share on other sites More sharing options...
z40acp Posted April 30, 2018 Share Posted April 30, 2018 That is what I hear also. The plastic is a little too thick and needs the back end sanded on an angle. Link to comment Share on other sites More sharing options...
Silverscooby27 Posted April 30, 2018 Author Share Posted April 30, 2018 Ok thanks!!! Link to comment Share on other sites More sharing options...
jcc7x7 Posted May 1, 2018 Share Posted May 1, 2018 18 hours ago, ddc said: I don't have a 140mm guage but I was under the impression that the stock 21 rounders with the stock base pads are a hair too long to fit. You either need aftermarket pads or grind down the stock ones a tad bit. 17 hours ago, z40acp said: That is what I hear also. The plastic is a little too thick and needs the back end sanded on an angle. About a30 degree angle off the last 3/16 of an inch. Then they fit Link to comment Share on other sites More sharing options...
awmp Posted May 2, 2018 Share Posted May 2, 2018 I have used the Sig factory 21 round mags and they have never let me down. Link to comment Share on other sites More sharing options...
ddc Posted May 3, 2018 Share Posted May 3, 2018 (edited) I'm curious why the factory X5 mags only hold 21 rounds. A 17 round factory 320 mag with an aftermarket kit will hold 22 . (apparently a possible 23?) Probably not a big deal on a 32 round COF but something to consider if you have a 24 round COF which seems to be a number I've seen more than once. Also I'm curious: M&P mags with a TTI basepad hold 23 rounds (I can confirm) . 320 mags with a TTI base pad hold 22 (Only my understanding from their website) The M&P mags and the 320 mags are very close dimensionally... where did that 23rd round go? Edited May 3, 2018 by ddc Link to comment Share on other sites More sharing options...
JAFO Posted May 3, 2018 Share Posted May 3, 2018 The differences could be in the design of the follower. Link to comment Share on other sites More sharing options...
ddc Posted May 3, 2018 Share Posted May 3, 2018 2 hours ago, JAFO said: The differences could be in the design of the follower. I wouldn't be surprised. Also: I just discovered that the TTI +5/+6 basepads I bought for my M&P mags also fit the 320 mags. But they only allow 22 rounds. That is with stock 320 spring and follower. Link to comment Share on other sites More sharing options...
Rudukai13 Posted May 4, 2018 Share Posted May 4, 2018 (edited) ddc, the Sig 17 round mags will hold 23 rounds with the Springer Precision EZ 140mm base pads AND the Grams Engineering spring and follower kit. Try adding the Grams kit to your mags with the TTI base pads, that should add another round to the capacity. The factory 21 round mags will hold 23 rounds using the Springer Precision base pads (the ones meant for the 21 round magazine tubes) and Grams internals as well. Once you have a magazine and base plate combination that equals 140mm in length, and use Grams internals, both the 17 and 21 round magazines end up holding 23 rounds Edited May 4, 2018 by Rudukai13 Link to comment Share on other sites More sharing options...
ddc Posted May 5, 2018 Share Posted May 5, 2018 On 5/4/2018 at 10:46 AM, Rudukai13 said: ddc, the Sig 17 round mags will hold 23 rounds with the Springer Precision EZ 140mm base pads AND the Grams Engineering spring and follower kit. Try adding the Grams kit to your mags with the TTI base pads, that should add another round to the capacity. The factory 21 round mags will hold 23 rounds using the Springer Precision base pads (the ones meant for the 21 round magazine tubes) and Grams internals as well. Once you have a magazine and base plate combination that equals 140mm in length, and use Grams internals, both the 17 and 21 round magazines end up holding 23 rounds Hey, good to know! Thanks for the info. Link to comment Share on other sites More sharing options...
Rudukai13 Posted May 5, 2018 Share Posted May 5, 2018 Happy to help. If you're interested in an extended "happy stick" mag that I think will fit the 170mm gauge, use the OEM 21 round magazine tube, add the Springer Precision extended base plate meant for the 17 rounders, and use the Grams 13-coil spring and follower kit. Should give you about 27 rounds reloadable. Check out my Project Nemesis thread for pics Link to comment Share on other sites More sharing options...
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