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Hello everyone, thank you for adding me to the forum. I just wanted to start by saying hello and that I hope everyone is having a great day. I have some questions regarding my Sten kit. I'm going to be building a Mk. V with an Indianapolis ordnance semi auto kit. I've been searching all over the internet but cant seem to find the answers I'm looking for. My first question being, what would you recommend as the best or maybe only way to pin the barrel? There's a collar around the rear part near the breech with a cutout as a timing section for the sights but I'm not entirely sure what to do. Is there a particular pin I need to use or is it as simple as drilling a hole in the barrel bushing and welding the pin in place? If so, what size pin should I go for? Second, and this may be a dumb question, but how do I go about headspacing? Is that done before pinning the barrel or is the barrel meant to be a quick change sort of deal? With it being a blow back design does it really matter? Thank you in advance!