Quoted: I pulled the bolt out of the carrier and it is still hangin up at about the spot of the LS. So I don't think it is an extractor issue. I colored the top of the LS with sharpie and ran the bolt carrier over it, but it didn't rub any of it off. All I can guess is that I tweaked the receiver when I pressed the LS in.
Entreprise reciever Clymer gauges STG-58 all matching kit Did not paint or finish inside of receiver .269 LS (I think it was a south african, it doesn't have the divot in it for punching it in)
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It's the receiver. Entreprise receivers are often times wildly out of spec. They have had entire batches of M14 receivers that were way out. It's been a couple years since they have had a widespread dimensional problem but given the fact that you are using an Austrian parts kit, I'd point to that. Locking Shoulders do not need to be pressed in. Simply tap it with a ball peen hammer gently until the shoulder area lines up with the recess in the receiver, then use a brass drift to pond it home, no need for a press. The chance of pooching the receiver would be greater, but like I said, I doubt you used enough force to ruin the receiver. Send the receiver back to Entreprise and tell them it is out of spec, believe me, they have heard that story before. The last Entreprise receiver I saw ( a customer brought it to my gunshow table) the mag well was cut so small there was no way a mag would ever go in the mag well.
DSA receivers are pretty close to the same price (dealer price) and are made from Steyr drawings, a much better choice. I personally will only build on DSA, Imbel or Rosario receivers, other American made receivers vary too much dimensionally.
You also described an Inch LS, most metric locking shoulders have a hole bored in the center, L1A1 locking shoulders tend to be smooth with no hole. You should be able to use an inch LS in a metric receiver.
Of course, without seeing the rifle, this is all a guess. Hope this info helps.