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That seems to be the golden rule for all of the magwell installations.

Absolutely, alignment of the magazine and subsequent position of the next round to be chambered is based off of the forward edge of the magazine opening in the receiver, as I have learned you can remove small amounts of material from the sides of the opening (as per R&R), but NEVER remove any from the front..

 

Do you have a small amount of "rock & lock" action just before the mag latch catches on the JTE magwell?

I have found on the TAC 47 magwell, the last bit of travel is the rear of the magazine just before lock-up.

 

I don't know who's is better or worse, I chose the TAC 47 for the side release, that function/motion is automatic for me. Yeah, I have been an AR operator for 3+ decades but I'm becoming quite fond of the Saiga 12