Dragracer - I also have a Rock CS-Tac in my carry rotation and since I've also installed a Wilson Round-butt mainspring housing in an effort to reduce the printing from that acute angle at the end of the grip frame, flush-bottomed magazines were necessary. I found SIG-branded 6-rounders at Cabellas that fit well and run reliably with my chosen Hornady Critical-Defense ammo. But unlike RockDoc65, I use polished stainless steel magazines for defensive ammo in both the Compact and the full-sized Rock Tactical that is my nightstand weapon. This way I know that if a magazine is shiny-bright it is loaded with Hornady JHP and not FMJ-ball ammo. As for the glitter factor giving away my position; the magazine is in the gun anyway and thus hidden from view. This over-two-pound hunk of steel is carried in an IWB holster with an overgarment (or OWB with an overgarment) an form-printing through that cover shirt or jacket is more concern than shiny parts to me*.
Just remember that while those mags that work in full-sized 1911's will run fine in your Compact, the reverse is not true and that 1911's are notoriously magazine-picky contraptions and what runs great in my gun may be totally unreliable in yours so take everyone's advice on what brand of mag to buy with a grain of salt until you have proven them in your gun.
*Full disclosure - my CS-Tac is customized with either stainless or polished muzzle-crown, spring plug, hammer, MSH, beavertail safety, thumb safety, slide release and locator pins with an aluminum trigger. It is also Cerakoted with a titanium-colored slide and a midnight blue frame so a polished stainless magazine doesn't make much difference as camouflage to me! I was issued my first black firearm in Vietnam back in 1968 so I am kinda over the whole "Tactical-Blackout" thing for my personal weapons though my nightstand Rock is still pretty nocturnal looking!
