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AR15.COM
3/13/2012 1:54:22 PM EDT
I purchased a Remington R-1 a couple of months ago and have ran about 150-200 rounds through it.  The last time I went to the range I ran off 6 of the seven rounds in the magazine.  The slide locked open as it would when a magazine is spent, but this had a round in the chamber.  I was able to fire it after reloading it back in the mag, but it happened a couple of more times.  I tried the other factory R-1 mag and it worked fine.....until today.  I was shooting slowly and working on my grip and trigger pull and it happened again on the first mag.  I used the same mag three more times w/no issues.  What gives?  I have several other firearms and have never had this happen before.  Bad mag?  Limp wristing it?  Ammo?  Little help
3/13/2012 3:12:31 PM EDT
[#1]
I'd say that it's more likely to be an issue of where your thumbs are than limp wristing. Try shooting it with a revolver style grip, thumbs down and lock over each other. If it still locks back without  your touching it, we can eliminate grip issues.
3/13/2012 5:14:26 PM EDT
[#2]
Do you shoot right or left handed? A friend of mine is a lefty and his forward thumb would ride on the pin of the slide stop causing premature slide lock due to pressure on the pin extending out of the reciever. We changed his grip a bit and he doesn't have problems anymore.

Round in the chamber, slide locked back. It sounds like a inertal feed from the mag. Does each mag follower have a dimple? The dimple is supposed to hold the last round on the follower long enough for the slide to complete its movement back, and then forward picking up the round and charging it into the chamber (overly simple explanation).

It could be a poor tension/ clocking issue with the extractor, but that usually mangles the case.