Finally got my second Handi. it came with 2 barrels. I want to take the .50cal barrel and put it on my other SB2 frame. When I put the barrel on this reciever, there is some play in the barrel. When I screw on the fore grip, it's a solid as a rock. I looked for any gaps where the barrel meets the reciever and I can't see any, looks to be flush and theres no barrel play. It will lock up easily and tight. What do you guys think. This barrel need to be fitted?