1045 Lower Receiver for GLOCK®

(11 customer reviews)

The 1045 is a dedicated 45 ACP GLOCK® magazine fed AR-15 billet lower receiver. It features last round bolt hold open.


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  • Last round bolt hold open on an empty magazine (LRBHO)
  • Flared magwell for faster reloads
  • Accepts 45 ACP GLOCK® magazines
  • Integrated, oversized trigger guard
  • Machined from 7075-T6 billet aluminum with a matte black hard-coat anodized finish
  • Requires upper receiver with an oversized ejection port for proper ejection
  • Threaded bolt catch screw
  • For use with a 45 ACP bolt carrier assembly and a standard AR-15 hammer
  • Lower weight: 10.8 oz
  • Patent pending
  • Accepts all aftermarket Glock® 45 ACP double stack magazines
Weight1.5 lbs
Dimensions11 × 7 × 2 in

Angstadt Arms


Angstadt Arms

11 reviews for 1045 Lower Receiver for GLOCK®

  1. Rudy K. (verified owner)

    Exceptional product …runs flawlessly with out blowback and direct impingement 45 uppers! This is the lower I have been trying to get someone to make!!!!!

  2. mplrolltide (verified owner)

    This is the 3rd manufacturer of a designated pistol caliber lower I have purchased. The Angstadt 1045 is BY FAR superior to the other 2, and it isn’t even close. The pictures don’t do this lower justice. This lower is built like no other lower I have purchased before. I was sitting at my FFL today and we both were amazed at the beefiness of the 1045 lower. I wish they would include an underneath picture so you can see the width of the trigger guard and understand what I mean by beefiness. I signed for this lower today and immediately did a Form 1 on it. I can’t wait to SBR it when the stamp comes back.

  3. Gary M. (verified owner)

    This is a very well made lower, both fit and finish.

  4. Kyle (verified owner)

    The fit, finish and quality is fantastic! This is by far the best quality 1045 lower on the market. I had many issues with 2 other brands, I’m happy I found Angstadt, they resolved all my issues.

  5. Luke K. (verified owner)

    I highly recommend this lower. It’s the only lower I’ve found that will work with a CMMG upper or a CMMG build using their BCG and barrel kit.
    It beats having to buy a dedicated CMMG lower when you can save money by buying this stripped lower.

  6. Lance H.

    very pleased with the quality, fit finish of the lower is hands down the best dedicated 45 acp AR lower you can buy!

  7. John B. (verified owner)

    Got to look at it at the FFL, looks awesome. Haven’t taken it home yet, as my ID is in renewal so need to go back with the other form of ID.

  8. Malcolm M.

    I got this lower elsewhere but want to say how satisfied I am with it. It is certainly the key part for a good build. The BHO works every time unlike another brand I have. I costs a bit more but worth it. Thanks.

  9. David Strnad (verified owner)

    Product is excellent.
    Just need more uppers!

  10. Drew (verified owner)

    It’s beautiful! I picked it up yesterday, and assembled it last night. It is the nicest(by far) AR45 lower I’ve looked at, and owned. I grabbed a Frontier after I missed the last stock of these, I’m gonna sell that. Funny, I ordered this from a dentists chair while getting a root canal, wasn’t going to wait, or miss this again…

  11. jgarcialaffitte

    Paired with a Gibbz Arms side charging upper, Craddock Precision barrel for a 10mm build. Tack driving beast and just waiting for the next hog hunt!!

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Angstadt Arms is born from a rich heritage of master gun makers, a family legacy spanning centuries, now reimagined with innovation and technology. We believe every gun owner is part of a grand story and we invite them to add a new chapter with us.

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Angstadt Arms 1045 AR-45 Lower Receiver
1045 Lower Receiver for GLOCK®

Out of stock