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Philadelphia Ordnance 80% Receiver

Discussion in 'Rifle Country' started by Phillies, Aug 28, 2011.

  1. Phillies

    Phillies Member

    I was looking at getting a Philly Ordnance 80% receiver to put on my M1 Thompson parts kit to make a nice display rifle. Could somebody tell me a little more about those 80% receivers? Will the bolt fit into that receiver? Will I be able to rack the slide a little with that 80% receiver?
  2. No. The 80% receiver has no bolt channel. Just a hole for the bolt cocking handle. It is recessed slightly to look like it has a channel for the bolt knob. It is very heavy, as it is solid steel.
  3. AlexanderA

    AlexanderA Well-Known Member

    The original bolt won't fit into the Philly Ord 80% receiver, but they offer a dummy bolt (stub) that's visible in the ejection port. It doesn't move. You use the extractor from your parts kit with this bolt. The dummy bolt must be installed from the front of the receiver before the barrel is screwed in. The cost of the dummy bolt is $50 plus you have to have the extractor slot milled which is another $50 option.

    In general, reciprocating parts are not a good idea in a dummy receiver, from a legal point of view.
  4. Phillies

    Phillies Member

    I wanted my display Thompson to basically have the same weight as a real working Thompson. Not having that bolt in there will bring the weight down a few pounds...
  5. If you want the weight to be CLOSER to original, get an aluminum 80% receiver, and have it powder coated. As far as ejector , bolt handle, and such, anyone with a drill pressor milling machine could adapt a dummy receiver to accept the issue parts. Just don't mill it beyond 80%.........
  6. Phillies

    Phillies Member

    Thanks. Now what about those demilled receivers I see on gunbroker and such that are nicely saw cut? Is there such a thing as having a demilled receiver that is almost too nicely cut?
  7. AlexanderA

    AlexanderA Well-Known Member

    Regarding the weight, I know that Philly Ordnance offers an option on their M1928 dummy receivers of milling a full-length channel on the inside so as to mimic the original weight (still won't accept the bolt). Maybe they can do the same for an M1.

    As to this idea of "80% completion," it's basically meaningless. Nobody can define what "80% completion" really is, and it's not mentioned anywhere in the ATF regs. It's just a shorthand way of referring to supposedly acceptable dummy receivers. Philly Ordnance has ATF letters approving their specific products, so you're OK as long as you don't make any further changes. The only "rules" as to what constitutes "constructive possession" of a machine gun come from some old court cases, which seem to imply that a dummy receiver can fall into that trap if it can be turned into a working machine gun with 8 hours or less of work in a well-equipped machine shop.

    Finally, regarding those neatly saw-cut demilled receivers that turn up occasionally, they're the result of old import regs that allowed a couple of saw cuts. Now, a receiver has to be torch-cut, with the cuts displacing at least 1/4" of material. If you have a parts set, and all the portions of a saw-cut receiver, it would be fairly easy for the ATF to make a case of "constructive possession" against you (after all, all it would take would be a few welds to restore the gun to operable condition, and the ATF doesn't care what it looks like as long as they can get it to fire two shots with one pull of the trigger). Certainly, welding a saw-cut receiver would take less than 8 hours in a well-equipped shop. Bottom line: be very, very careful messing with those saw-cut receivers.
  8. Phillies

    Phillies Member

    Thanks for the info. Seems like an odd grey area with those saw cut receivers. So I guess they are not illegal but at the same time can be considered illegal if you have a parts kit on it. Who knew making a dummy gun would be that complicated lol

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