9mm AR Upper

[Jedabug92]

I seek knowledge.
Looking into a 9mm upper. any input?
What works what doesn't. Do the mag well conversions work?
I seek information.

From my sniper hide

 

[BigDiezel]

Hahn dedicated block works well with no problems straight outta the box .. I'd suggest it over others hands down.

 

[Jedabug92]

Hahn dedicated block works well with no problems straight outta the box .. I'd suggest it over others hands down.

So build an entire 9mm ar?

From my sniper hide

 

[BigDiezel]

If your just wanting an upper to switch out , I'd stay with the Hahn blocks. They have a couple ones to choose from dedicated , top load & bottom load. I used the dedicated and just left it strictly 9mm build, I won't ever change it. Check with JSE surplus if you want to keep the cost down , Cmmg and the guys at Adco are good to go aswell.

 

[Jedabug92]

If your just wanting an upper to switch out , I'd stay with the Hahn blocks. They have a couple ones to choose from dedicated , top load & bottom load. I used the dedicated and just left it strictly 9mm build, I won't ever change it. Check with JSE surplus if you want to keep the cost down , Cmmg and the guys at Adco are good to go aswell.

Yea I'd prefer just an upper but are there any feeding issues with just the upper+conversion block

From my sniper hide

 

[Biggsly]

I agree with BigD. The Hahn block works great. I have also used Rock River and Spike's blocks without problems. I had a CMMG lower that was a one piece 9mm lower.

 

[BigDiezel]

You shouldn't have any problems. Build it and take it to the range , take some tools with ya just incase. You won't know 100% till you let her rip. I prefer the ejector to slightly ride the bolt & make sure it locks back. It's just something I've done & works if I have problems . 9mm and .22 builds can be a bit finicky...

 

[Jedabug92]

You shouldn't have any problems. Build it and take it to the range , take some tools with ya just incase. You won't know 100% till you let her rip. I prefer the ejector to slightly ride the bolt & make sure it locks back. It's just something I've done & works if I have problems . 9mm and .22 builds can be a bit finicky...

Once they get rolling do they stay good or do they have to be tuned every so often?

From my sniper hide

 

[BigDiezel]

Once you get em goin they should be good for awhile. I'm not over 1000rds yet on my build . I've done a few for family and most have seen 5k or more no problems . Just keeping it clean would be the most important part.

 

[Jedabug92]

Once you get em goin they should be good for awhile. I'm not over 1000rds yet on my build . I've done a few for family and most have seen 5k or more no problems . Just keeping it clean would be the most important part.

Would you mine helping me get the right parts and assemble it?

From my sniper hide