I already know about the plugs debate of why some like and dont like. I used the schere slug plug a for a while but I hate how it sticks out flush to the mag because if your palm hits it then the mag wont fully seat. I have a 21sf and tried the jentra but it didnt fit very well but now I saw pearce has one out so thought I would give it a try. Mainly I want it because if you mag change quickly the top round in the mag tends to get caught on the frame. The area inside the mag well where there is that half circle cut out grabs the rim of the top round and the mag hangs up. The stupid plugs fill that space and even it out so the mag slides in smoothly. I read from a member here that he installed a plug and it cracked the frame right by the lanyard hole so now I am hesitant to try another one. So what have you guys heard? Not much comes up in a search about this so I am guessing its a small issue if any.