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Firstly better to use a correctly size star bit - I find hex (or allen) keys strip them really easily.

Secondly you don't need to tighten it down a lot - just finger tight. I learned this because I was having double feed issues due to over tightening.

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I bought a second hand bar 10 and the previous owner had totally stripped the rear screw. I use a dremel and a router to cut a slot (but later replaced it as it was gradually disintegrating).,

I have heard that if you super glue a screw driver into the hole this can get it out also. Wait for it to set, unscrew, then snap it off afterwards. Never tried it though!

Other option is to drill it out but I would really avoid that as you could chew up the thread in the stock and then you'd be in trouble!

 

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I must say I have never used the super glue method so no idea if it actually works. Just heard some people do it.

To give you an idea:

However as you can see the large cutting wheel cuts into the wood of the door! Clearly you don't want to do that to the body of the gun.

I used a router to cut the hole wider sideways. Like is said though it needed replacing after that.

Maybe drill 2 small holes, one each side of the current one, so it forms a slot. Would need filing to make it safe to use but ok it you just replace the screw straight away.

 

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Its a pain, I know because I had this issue too. Have you tried loosening the front body screw a little? Or tightening it more (if not already tight)?

Just needs fiddling with unfortunately, there is no magic cure.

You could try putting a stronger spring in there just in case. Like out of a pen - cut it down a bit.