The 202B are very strong, I've built a number of DR on them. A thing to remember about all shotgun conversions is that the mono-blocks are profiled for the slim breeches. If you re-use them the barrel profiles will pretty much follow that of the original barrels. Personally it doesn't bother me, but some purest will argue against it. Actually I have found that if you make a new mono-block trying to follow the frame without proper taper, it comes out looking like a beer can with tubes stuck on it. JMHO.