Buy them with the right of return if they don't work.

So make sure you get them from a big supplier or sporting goods store that will take returns, especially for stuff that mechanically will not work due to standard rifle design.

Best if one with a no questions asked return policy.

I intend to buy a 93GL in the not too distant future, so whatever you are doing will save me time and effort, whether or not it works out OK.

Good luck.