I just acquired a Remington 552 Speedmaster .22. I was getting ready to mount a scope on the grooved receiver (I had the receiver clamped in a vice) when I noticed that I could move the muzzle up-down and L-R about 1/8"!!! I disassebled the gun and examined everything. The forend screw was tight. It holds the forend tight to the barrel but the barrel moves relative to the receiver. Is there a way to tighten the barrel/receiver fit (I thought about knurling the barrel where it engages the receiver) or do I need to find (make) a bridge ttype scope mount that attaches to the barrel?