You sure can, it's actually pretty easy. Flip the rifle over with the iron sights on the floor or table. Behind the trigger there is a little tab, push this tab towards the muzzle of the gun (a screwdriver will aid in this step). This enables you to remove the trigger group and the attached box magazine. Put the trigger group back in and push really hard on the trigger guard. If you put the safety in the "off" position it will snap in a little easier. Also use your screwdriver again to push the tab forward will you push on the trigger guard. You're done. What brand of detachable mags are you using? I have a Yugo SKS and have had no luck with them. I hear Tapco is a good brand but have'nt tried them yet.