If you plan on glue the SCS to the arm, you need to triple check to make sure that it's perfectly center or your bbs are gonna fly left or right. Look down the barrel with the SCS fully engage and see if it's centered, then glue. The way I have it is, there is some movement from left to right so I can adjust it if the bbs are curving. I don't recommend gluing it but it's up to you. Good luck with that.
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