Quoted:
If it really is a customer's gun, what do you think was going through his mind at the range when this occurred???
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I'd say that he/she's lucky that the bolt didn't go through their mind.
I saw a ruger 10/22 barrel cutaway that looked similar to that back years ago. Scarry.
BTW, squibs are easy to make. I have made them with my son years ago for the sake of his inquisitiveness. We had a model rocket that FTF so we made some souped up squibs that were sure fire. That experiment led to others that were a little more potent. Potent enough to use as initiating charges for blasting rocks on our sidehill property.
Start with a piece of thin wire as in one strand of wire from an old extension cord. Fold it into a V and use masking tape to "insulate all but the three ends. Using a paste of blackpowder, make a ball no bigger than 1/4 inch or less. Depending on what you want to do with it. Mash the wet ball of blackpowder paste onto the V end and let dry completely. Once dry coat with epoxy or paint. You have a squib that will initiate a model rocket or anything else [;D] you might want to pop.
Remember, It's all fun and games till somebody loses an eye!