Ifishsum, you and Joshawa have the same problem, the barrel collar has for some reason backed off and let the barrel move forward. Been while but IIRC you remove the mag tube to get the forend off. Technically you use a spanner to tighten/loosen the barrel collar, but you can use a hammer and punch if done carefully. This will solve your problem. Excess headspace indeed! Here endeth the lesson. Goatwhiskers the Elder
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