CADA (Lego-Compatible) AK-47 Modification

Since Lego, in all their wisdom, refuse to produce weapons of war (i.e. firearms), we are left to get our wonderful, fantastic, totally awesome weapons of war from other - i.e. less expensive - companies. Take this beautiful example of a weapon here - the AK-47 with shoulder sling; working scope, trigger, safety and bolt; along with detachable mazazine. [CADA # C16009 from YOWBB](https://www.yourwobb.com/products/cada-c61009-ak-47-assault-rifle). The only problem with the finished product is that they insist on putting that stupid little orange cap on the end of the barrel, completely ruining the illusion. I didn't have the required pieces in black in my spare parts bins, so I 3d printed my own.

The models that come with LDraw are too blocky and didn't fit right, so I redesigned the files myself in FreeCAD. The two pieces fit together perfectly, but they are a hair loose when mating to standard Lego-compatible bricks. In this case, it doesn't matter so much, though, because the cen