Looking for some input - got the aluminum breech- very nicely machined and anodized, comes with a steel bolt/handle too. Excellent deal for the money. However, I found the new breech won't let the bolt handle slide down into the groove. This is using a stock 1377 barrel.
I have a couple options, neither of which is a problem with my "poor man's lathe" AKA drillpress.
1: turn down the bolt handle about 1 mm total
2: cut the force cone a hair deeper
I'm not averse to either, just looking for some input. As this breech will be dedicated to my 1377, it's not a problem if I have to do one-off stuff since I have other Lego to play with: a 1740, 2400KT, and by mid-Friday, a Maximus.
film at 11 the lime-green arrow indicates the binding point.