Will the Ruger PC 40 convert to accept magazines from other guns, i. e. can I use my SIG magazines in it? I'm looking to upgrade my S&W 5904 & Marlin Camp rifle in 9mm to 40 S&W to have one caliber, one magazine for both. Any comments, suggestions or other ideas? The SigSauer .40 is now my departments required sidearm, no choice but the Sig. Thanks, FM12