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Author Topic: 9mm AR Bolt Carriers  (Read 346 times)

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Online M1A_All_Day

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9mm AR Bolt Carriers
« on: March 15, 2019, 07:30:32 PM »

Given pistol caliber Glock-Mag compatible AR uppers are so popular now, I figured I’d share my experience with three different bolts I have on-hand. The gas key portion is obviously not important, as the pistol caliber uppers are all blowback-operated. The key does serve as a guide in the charging handle track and you’ll see some differences in the contours.

Compatibility and serviceability are the most important factors to me. The JP Enterprises silent captive buffer shortens the buffer tube by ~1.5”, making your brace very short. To use the JPE buffer, the back-end of your bolt must be open as the center pin of the JPE buffer needs that space to operate. 9mm bolts all have very different designs for a removable bolt carrier weight, which is removable is the first place to allow tuning of the overall bolt carrier weight.

The Echo trigger is not legal in Connecticut, but for readers in other states, I took measurements to note compatibility. It’s all about the opening on the underside being wide enough to let the Echo disconnector pass by as the bolt moves backwards. I’ve  seen people mutilate 9mm bolts with a dremel or badly controlled router- better to just get one that is milled correctly in the first place.

A threaded extractor screw is also a winning feature for cleaning. Most I’ve seen have a blind roll pin that would be a PITA to move for routine cleaning.

Troy M5 Carbine 9mm bolt - $??
- ?? Ounces
- Weight plug - roll pinned
- Phosphate/parkerized finish
- Not compatible with JP Enterprises silent captive spring
- Exactor - blind roll pin
- Not Echo trigger compatible

Odinworks 9mm bolt - $160
- 14.9 Ounces
- Weight plug - roll pinned
- Nitride & Melonite finish
- Is compatible with JP Enterprises silent captive spring
- Exactor - blind roll pin
- Not Echo trigger compatible

Stern Defense 9mm bolt - $170
- 15.5 Ounces
- Weight plug - threaded hex screw
- Nickel-boron finish
- Is compatible with JP Enterprises silent captive spring
- Exactor - threaded hex screw
- Is Echo trigger compatible


I’d be curious if anyone has specs for others- including DLD, Angstadt, Faxon, etc.

First picture: Top to bottom- Stern, Odinworks, Troy (with weight plug not removed).
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« Last Edit: March 15, 2019, 07:32:26 PM by M1A_All_Day »


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Online M1A_All_Day

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Re: 9mm AR Bolt Carriers
« Reply #1 on: March 15, 2019, 07:31:14 PM »
A few more:


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Re: 9mm AR Bolt Carriers
« Reply #2 on: March 15, 2019, 10:04:57 PM »
how about mag well adapters?

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Re: 9mm AR Bolt Carriers
« Reply #3 on: March 15, 2019, 11:15:21 PM »
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how about mag well adapters?

How well a magwell adapter for Glock mags works in a spec AR15 lower- no idea. They had several and Newington Gun Exchange last weekend. You’d still have the same upper and bolt constraints.

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Re: 9mm AR Bolt Carriers
« Reply #4 on: March 19, 2019, 09:59:25 PM »
here is a 9mm from a Freedom Shoppe other, came on a new frontier lower. Does not hold on last round.
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Re: 9mm AR Bolt Carriers
« Reply #5 on: March 19, 2019, 10:00:11 PM »
another view

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Re: 9mm AR Bolt Carriers
« Reply #6 on: March 19, 2019, 10:02:50 PM »
bolt face

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Re: 9mm AR Bolt Carriers
« Reply #7 on: March 19, 2019, 10:24:15 PM »
Thanks! Appears that the New Froniter bolt has the plug-type weight with a roll pin (that would work with JPE SCS). I’m not seeing an extractor from the bolt face perspective, maybe it’s tucked-under there (it’s gotta grab a case somehow...) Very blocky looking blog, too- interesting.

None of the 9mm AR-pattern bolts will have last round bolt hold open by themselves- it’s either a function of the lower having something to bridge the gap between the magazine follower and the bolt catch OR I’ve seen LRBHO integrated into the upper with a little pawl that gets pushed-out when the follower contacts it and consequently pushes the bolt catch upwards.
« Last Edit: March 19, 2019, 10:44:14 PM by M1A_All_Day »

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Re: 9mm AR Bolt Carriers
« Reply #8 on: March 19, 2019, 11:35:54 PM »
The extractor is at the 10 o'clock position on that pic.

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Re: 9mm AR Bolt Carriers
« Reply #9 on: March 20, 2019, 07:18:33 PM »
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how about mag well adapters?

So far I've had luck with the EndoMag and a Foxtrot Mike 9mm upper.

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Re: 9mm AR Bolt Carriers
« Reply #10 on: March 22, 2019, 11:49:28 AM »
Found this today