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Thread: Uber-tight upper:lower fit, how to loosen?

  1. #61
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    From reading some other posts of yours I understand you are after weight savings by using this upper. How many ounces are we talking about?

  2. #62
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    No forward assist shaves 1+ oz.

    (which is now where someone will wander in and blather on about "all of this for an ounce" or some other waste of typing)

  3. #63
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    Quote Originally Posted by scottryan View Post
    Thats up for debate.

    Not from me.

    I've had a couple of idiot tight Baer 1911s.

    Just don't see what they thought was so cool about a mainspring housing that had to punched out of the frame and then hammered back in.

    I wouldn't be molesting any of my good lowers with that upper and a hammer. Fit the upper.

  4. #64
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    I cant but help but to wonder if the Leas bear lowers would fit it better??
    Or if it would be even tighter with the two of them together.

  5. #65
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    Quote Originally Posted by rob_s View Post
    No forward assist shaves 1+ oz.

    (which is now where someone will wander in and blather on about "all of this for an ounce" or some other waste of typing)
    You will save even more weight by filing off the metal on the lugs...
    "Perfect Practice Makes Perfect"
    "There are 550 million firearms on this planet. That's one firearm for every 12 people. The question is... How do we arm the other 11?" Lord of War.
    "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." Thomas Jefferson

  6. #66
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    Quote Originally Posted by Ironbutt View Post
    My DD V3 middy's pivot lug is super tight on my S&W M&P lower & on my new PSA lower build. I need a mallet & wooden dowel to get it out. The rear lug is normal. I was hoping it would loosen up with use, but that ain't happening, so I may have to do something about it.
    I have the same issue with a DD upper and a Bushmaster lower. The pivot pin will not go in unless I hit it with a mallet. Has anyone measured the diameter of the pivot pin hole on a DD upper and compared it with another upper like BCM, LMT, Colt, etc?
    Last edited by ClearedHot; 08-27-11 at 23:59.

  7. #67
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    Make sure there isn't a burr on the pivot pin first, where the retaining pin slot is machined.

  8. #68
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    I purchased a used Del-Ton upper reciever for cheap off of the EE a while back. I used it to build a dedicated .22 for my son, on a Stag lower. I had fit issues, to the point that the takedown pin had to be hammered in while at the same time forcing the recievers together. It turned out that the problem wasn't the pin holes, but rather the milling of the recievers not mating up. It turned out that the Del-Ton upper was a fraction too long in the rear. I was able to remedy this with a emory board. I wasn't afraid to do this to this reciever because it to be used as a .22 only. In the attached picture you can see what little bit of material had to be removed, and now the two close up easily and with no slop.

    -Matt


    ----------
    "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin

  9. #69
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    Good info Matt, thanks.

  10. #70
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    I know this will sound ghetto, but sometimes just using a standard drill bit close enough to the hole size will work too. I would try to do it by hand at first. Just manipulate it in and out and spin it in circle while rotating at the same time. Sit around and watch tv while taking your time. The hole will open up. If you need to go faster, use a drill at very low speed. But mount the drill to a table so it is solid. Its too easy to tip the drill and easier to maintain the proper plane with the lighter upper.

    I know this is ghetto... but if you want to spend the cash, you could also bring it to a machine shop.
    "You done good. Remember the rules of home gun smithing: Measure it with a micrometer, mark it with chalk, cut it with a torch/dremel, grind it to fit, paint it to match with a sharpie!"

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