From quietbore.com. No sketch. Has to be drilled etc. Anyone trying to use one as a can without heavy modification would blow their rifle up. Those modifications are legally permissible only after receipt of the approved tax stamp. Until receiving the stamp, it stays in its definitely a solvent trap configuration.

I looked at various sources and yes, some sites are... sketchy. QB and a few others aren’t. Ultimately I decided on QB for their quality, reviews and videos I found of other form 1 builds on arfcom, YouTube, and reddit.