Years ago I had a G17, it was an early glock. It came with the 3.5# trigger setup, and the grip plug. I was the third owner. It was a police academy training gun first, then sold to the guy I bought it from, he was a policeman. He said he only put a couple thousand through it, but did not know how many it had before that. I was told that they were traded in at about 25K by another policeman later. I put almost 20K through it before I got sick of it and sold it. NEVER and I mean never did it jam. Not for me or anyone else that shot it. It was an amazing gun from a relaibility standpoint, but was horribly inaccurate. The very best shooters in the club could get it to do about 5" at 25 yards. More than MOBG (minute of bad guy) accuracy, but not enough to satisfy me. It never got any worse so I was inclined to believe that it had never been much better. My brother currently has 2, a 23 and a 21. Niether are very accurate and the 21 is WAY off of POA with any ammo but both are dead relaible. His are newer models. The only mod a glock needs is more ammo!!!