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AR15.COM
6/14/2026 9:32:51 PM EDT
[Last Edit: INMY01TA][Edited]
Hey guys I have a 4.5” RXM. I bought a gen3 Glock 17 threaded barrel and it doesn’t work. No worries I’ll use it with my G17 Polymer 80 build but what fits the RXM? Thanks in advance.
6/14/2026 10:15:43 PM EDT
[#1]
I believe they are G19 pattern locking block.
WTB: Steel Bodied Surefire Trainer
6/14/2026 10:37:18 PM EDT
[#2]
Quote History
Originally Posted By Postal0311:
I believe they are G19 pattern locking block.
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So I’d need a G47 threaded barrel?
6/14/2026 11:27:24 PM EDT
[#3]
Yea, you'd need a gen 5 pattern barrel for a G17 or G47.  Gen 5 unified all the models around the old G19 locking block geometry.
6/14/2026 11:30:24 PM EDT
[#4]
Quote History
Originally Posted By D_Man:
Yea, you'd need a gen 5 pattern barrel for a G17 or G47.  Gen 5 unified all the models around the old G19 locking block geometry.
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Ok great thank you.
6/15/2026 7:43:41 AM EDT
[#5]
Great info!  The Arfcom brain trust does it again!  I am constantly amazed at the knowledge of the members here.
6/23/2026 3:55:43 PM EDT
[Last Edit: INMY01TA][Edited] [#6]
Gen 5 G17 fits.


6/28/2026 3:16:58 AM EDT
[#7]
Quote History
Originally Posted By INMY01TA:
Gen 5 G17 fits.


https://i.postimg.cc/jSPy8Qvp/IMG-4061.jpg
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As will a Shadow Systems DR barrel.  

They make the DR920 with a threaded and non treaded barrel. The DR920 is essentially a Gen4 Glock with a G17 length grip and a G19L slide.  

I picked up a non threaded bronze DR barrel this weekend to use as both an extended barrel in a G19 size slide, and with a G17 slide for a future RXM project.
Froot Loops are all the same flavor. They just taste like froot. Whatever the heck that is.

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