I did the same thing this weekend on what the op was thinking of. Since I don't have the funds yet to complete my open gun build. I pick up an inexpenside c-more mount for my RIA TCM 9mm, some allen screws at home depot, took off my magwell and mag release on my para p18 and voila!!!!. Since I'm still shooting production and will be shooting single stack minor soon, I didn't bother putting a comp on this gun that way I can load same ammo for all my three guns. I built it just for local match and a mess around gun. I only shot @ 100 rounds just to sight it in, so far so good. It's not pretty but it will do the job