Someone has done it!!!! Direct Impingment(ish) 17HMR !!!

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[ARCHIVED THREAD] - Someone has done it!!!! Direct Impingment(ish) 17HMR !!!

Posted: 10/7/2017 8:13:15 PM EDT

Link to official website

Looks like it uses a roller lock system like HK guns.

No more kabooms

Don't know much yet. Looks like a review is going to be coming out on Monday (saw it on RFC).

Need to email the company about different barrel lengths and how that affects the upper (18" is all they offer).

Black Dog mags

10 rounds

(But possibly higher capacity ones will come out from BD

)

Only other gripe is the crappy Hogue handguard they are selling it with

Price is 599.00

Posted: 10/7/2017 9:41:50 PM EDT

[#1]

Saw the prototype several years ago.....it's not direct impingement nor is the roller lock delayed blowback like an HK.......the "gas key" is actually the locking piece and is moved to the rear by a gas tube venting from the gas port..........glad to see they finally got it to market

Posted: 10/7/2017 10:05:22 PM EDT

[#2]

Quote History

Quoted:
Saw the prototype several years ago.....it's not direct impingement nor is the roller lock delayed blowback like an HK.......the "gas key" is actually the locking piece and is moved to the rear by a gas tube venting from the gas port..........glad to see they finally got it to market

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So what do you think of the chance of a KB like the old semiauto's?

How durable?

I am seriously looking at one.

Wife went out shooting my CZ455 in 17hmr and wants a 17hmr and I am thinking of picking one up for me and lettering her us mine. Problem is when we go hunting we shoot ~500-1000 rounds in a day (semi auto might be more

)

Wonder on the life of the barrel/bolt etc....

Posted: 10/8/2017 1:18:11 AM EDT

[#3]

Quote History

Quoted:
Saw the prototype several years ago.....it's not direct impingement nor is the roller lock delayed blowback like an HK.......the "gas key" is actually the locking piece and is moved to the rear by a gas tube venting from the gas port..........glad to see they finally got it to market

View Quote

Could a system like this work for 9mm?

Posted: 10/8/2017 1:55:47 PM EDT

[#4]

Not for long I would suspect.....the locking point for the bolt is the small silver ring you see in the picture......easily handles the stress of a 17......main issue was the wall thickness of the case anyway......so not a huge amount of stress to worry about. A centerfire 9mm with a 124 grain bullet the stress goes up exponentially form the 17 rimfire so I'd personally be uncomfortable with the concept on a 9mm. I haven't shot it but I know several cases of ammo were run through the prototype with no kabooms.....and from talking with friend who was making the prototype at the time......it was a hell of a lot of fun to shoot.

Posted: 10/8/2017 2:07:15 PM EDT

[#5]

Standing by for a Micro AR in 22TCM.

Posted: 10/8/2017 4:02:47 PM EDT

[#6]

Quote History

Quoted:
Not for long I would suspect.....the locking point for the bolt is the small silver ring you see in the picture......easily handles the stress of a 17......main issue was the wall thickness of the case anyway......so not a huge amount of stress to worry about. A centerfire 9mm with a 124 grain bullet the stress goes up exponentially form the 17 rimfire so I'd personally be uncomfortable with the concept on a 9mm. I haven't shot it but I know several cases of ammo were run through the prototype with no kabooms.....and from talking with friend who was making the prototype at the time......it was a hell of a lot of fun to shoot.

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Any idea on if the gas block is adjustable or how it runs suppressed?

How about shortening the barrel?

Also fixed title as DI (ish) 17hmr upper

Posted: 10/8/2017 10:32:44 PM EDT

[#7]

Quote History

Quoted:

Any idea on if the gas block is adjustable or how it runs suppressed?

How about shortening the barrel?

Also fixed title as DI (ish) 17hmr upper

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Quote History

Quoted:

Any idea on if the gas block is adjustable or how it runs suppressed?

How about shortening the barrel?

Also fixed title as DI (ish) 17hmr upper

No Idea.....

....I got to see it...take it apart and look at the mechanism.....but was under a non disclosure and got no time to actually shoot it or otherwise experiment.

Quoted:
Standing by for a Micro AR in 22TCM.

I've actually done one of those...fed it with PPS43 magazines and my Tok 15 mag adapter.

Posted: 10/8/2017 10:45:14 PM EDT

[#8]

Not happy w/ Alexander Arms' offering that's been out for several years now?

http://www.shopalexanderarms.com/AR-15_Uppers-_17_HMR_Complete_Upper_Assembly.html

Posted: 10/8/2017 10:46:42 PM EDT

[#9]

Quote History

Quoted: I've actually done one of those...fed it with PPS43 magazines and my Tok 15 mag adapter.

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What sort of velocities did you get out of it? Seems easier to reload than 5.7x28mm, would fit in more guns.

Posted: 10/8/2017 11:55:46 PM EDT

[#10]

Quote History

Quoted:
Not happy w/ Alexander Arms' offering that's been out for several years now?

http://www.shopalexanderarms.com/AR-15_Uppers-_17_HMR_Complete_Upper_Assembly.html

View Quote

The problem in my opinion with Alexander Arms as well as Ray Vin 17 hmr uppers is they need to be cleaned more often and you run a higher risk of an OOBD because it is a gas blow back and 17hmr is known for not doing well in blowback guns.

I know AA has a stout bolt but still something that locks up is preferable to me.

This new gun is more of a DI (ish) style gun and shouldn't have the same issues.

Posted: 10/11/2017 1:50:55 AM EDT

[#11]

Quote History

Quoted:
Standing by for a Micro AR in 22TCM.

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Someone showed one of those at SHOT like 2 years ago, nothing since though.

Posted: 10/12/2017 9:39:57 AM EDT

[#12]

http://www.thefirearmblog.com/blog/2017/10/11/garrow-firearms-development-17-hmr-ar15/

It looks like they're just using spring loaded ball bearings to keep the bolt from moving under pressure from the case, then using gas pressure to overcome the ball bearings. Or is the gas block actually sliding on the bolt carrier and moving the ball bearings in & out?

Either way, the length of that buffer looks suspiciously short, like the gas key will knock hell out of the top of the lower.

Posted: 10/12/2017 10:44:23 AM EDT

[#13]

Quote History

Quoted:
http://www.thefirearmblog.com/blog/2017/10/11/garrow-firearms-development-17-hmr-ar15/

It looks like they're just using spring loaded ball bearings to keep the bolt from moving under pressure from the case, then using gas pressure to overcome the ball bearings. Or is the gas block actually sliding on the bolt carrier and moving the ball bearings in & out?

Either way, the length of that buffer looks suspiciously short, like the gas key will knock hell out of the top of the lower.

View Quote

On the prototype I saw....the gas key is moveable and is what locks the locking balls into the locking recesses threaded into the side of the upper receiver. Similar to a HK locking piece but rather than just delaying extraction, until gas is tapped at the port and moves the gas key, the locking pieces can't disengage from the locking recesses.

[ARCHIVED THREAD] - Someone has done it!!!! Direct Impingment(ish) 17HMR !!!

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