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  1. O

    M1/M1A bolt

    Are the botls from M1 Garands identical or otherwise compatible with those of the M1A? I ask because I am playing with an idea for an M1A bolt I am modeling. The M1A bolt is not the easiest to CAD up and the prints I have are fuzzy-at-best. Someone sent me a partially completed model but it...
  2. O

    Rifling Question

    I've looked for this elsewhere but see no references, so here I am... Legally speaking, is there a requirement that a rifled shotgun barrel's rifling have actual twist, and if so, it there a minimum rate? IOW, can I legally have a rifled barrel where the rifling is straight or so close to it...
  3. O

    Sear engagement

    I am in the process of designing a trigger for AR10/15 rifles and am wondering whether anyone could tell me what the typical range of adjustment for sear engagement would be in a typical match rifle. My thinking has been in the 0.025" ballpark, but I am not sure about minimum engagement for...
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