I received 2 dragonfly mk2 rifles in 22 cal recently and was stoked. I immediately started testing and sighting in the rifles. However by the time I shot 20 or 30 rounds both rifles lost pump screws and the stock screw started lossening. What's worse is the lock washer got lost in the oak leaves. I called Air venturi and they were very sorry they couldn't send me a part due to a rough update on thier software. This is not an indictment of the company tho. He offered to replace the rifle but I couldn't justify sending it back for an 11 cent part. My dad brought over a magnet and we dragged it around the leaves until we found it. Ok problem solved. My advice to new owners is to glue the screws in. Blue locktight works fine but I chose clear nail polish. I'm sure there are some other products that are just fine as well. Just don't use red locktight. Use it on all 3 pump screws and stock screw. I will be making a full review with honest accuracy and velocity in about a week after I thoroughly break the gun in and do testing. I would not recommend just tightening the screws. It seems like it definitely requires glue. - Raden