Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel

Log In

A valid email is required.
Password is required.
Site Notices
Basic
  • Joined Jun 2013
  • Posts 31
  • Location USA PA, USA
Offline
Basic
  • Joined Jun 2013
  • Posts 31
  • Location USA PA, USA
Offline
Posted: 9/24/2013 4:28:06 PM EST
Well I just machined an "EP Lower" 80% polymer lower receiver, and I'm sitting here looking at it and wondering: How would this thing hold up in a 9mm application?

Has anyone done this?
Member
Avatar
Bronze
  • Joined Aug 2001
  • Posts 7001
  • Location USA FL, USA
Offline
Bronze
  • Joined Aug 2001
  • Posts 7001
  • Location USA FL, USA
Offline
Link Posted: 9/24/2013 4:44:45 PM EST
When I had a 9mm upper I ran it on one of my CavArms lowers. Worked fine.
-"The truth does not require your belief in it to function."
-Genuine science is about gathering evidence and testing the veracity of theories, not cheerleading for a particular ideology.
Basic
  • Joined Jun 2013
  • Posts 32
  • Location USA PA, USA
Offline
Basic
  • Joined Jun 2013
  • Posts 32
  • Location USA PA, USA
Offline
Link Posted: 9/24/2013 5:03:26 PM EST
Thanks for the reply; that's encouraging. (I was worried about "egging" the hammer pin holes).

Can you estimate how many rounds you might have put through it?
Member
Avatar
Platinum
  • Joined Jan 2001
  • Posts 7467
  • Location USA CO, USA
Offline
Platinum
  • Joined Jan 2001
  • Posts 7467
  • Location USA CO, USA
Offline
NRA
Link Posted: 9/24/2013 5:20:46 PM EST
Probably 5k rounds down my cavarms 9mm host, no problems.
"The only real difference between the men and the boys, is the number and size, and cost of their toys."
NRA Life, GOA Life, CSSA Life, NRA Certified Instructor, FFL/SOT 07/C2
Member
Avatar
Bronze
  • Joined Aug 2001
  • Posts 7003
  • Location USA FL, USA
Offline
Bronze
  • Joined Aug 2001
  • Posts 7003
  • Location USA FL, USA
Offline
Link Posted: 9/24/2013 5:25:57 PM EST
I probably only had 500 rounds or so through it (I'm guessing since its been a little while). The CavArms guys had a few they put 10s of thousands of rounds through and they should be GTG.
-"The truth does not require your belief in it to function."
-Genuine science is about gathering evidence and testing the veracity of theories, not cheerleading for a particular ideology.
Basic
  • Joined Feb 2013
  • Posts 9
  • Location USA WI, USA
Offline
Basic
  • Joined Feb 2013
  • Posts 9
  • Location USA WI, USA
Offline
Link Posted: 9/25/2013 2:23:16 AM EST
Originally Posted By AR_George:
Well I just machined an "EP Lower" 80% polymer lower receiver, and I'm sitting here looking at it and wondering: How would this thing hold up in a 9mm application?

Has anyone done this?
View Quote


Care to share a link for buying info?
Member
Avatar
Platinum
  • Joined Jan 2001
  • Posts 7470
  • Location USA CO, USA
Offline
Platinum
  • Joined Jan 2001
  • Posts 7470
  • Location USA CO, USA
Offline
NRA
Link Posted: 9/25/2013 5:43:29 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By gtfoxy:


Care to share a link for buying info?
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By gtfoxy:
Originally Posted By AR_George:
Well I just machined an "EP Lower" 80% polymer lower receiver, and I'm sitting here looking at it and wondering: How would this thing hold up in a 9mm application?

Has anyone done this?


Care to share a link for buying info?


I've got no affiliation, just providing the requested link, and linking a pic from their site.

http://www.eplowers.com
"The only real difference between the men and the boys, is the number and size, and cost of their toys."
NRA Life, GOA Life, CSSA Life, NRA Certified Instructor, FFL/SOT 07/C2
Basic
  • Joined Jun 2013
  • Posts 33
  • Location USA PA, USA
Offline
Basic
  • Joined Jun 2013
  • Posts 33
  • Location USA PA, USA
Offline
Link Posted: 9/25/2013 2:32:19 PM EST
You can also get them from Midwest Industries.

Basic
  • Joined Feb 2012
  • Posts 75
  • Location USA PA, USA
Offline
Basic
  • Joined Feb 2012
  • Posts 75
  • Location USA PA, USA
Offline
Link Posted: 9/25/2013 5:39:46 PM EST
Where are you getting your 9mm uppers and mags?
Basic
  • Joined Jun 2013
  • Posts 34
  • Location USA PA, USA
Offline
Basic
  • Joined Jun 2013
  • Posts 34
  • Location USA PA, USA
Offline
Link Posted: 9/26/2013 4:32:44 PM EST
I think 9mmAR has some RRA uppers, and I see metalform 9mm magazines at several places, e.g., Midway.
Basic
  • Joined Jun 2013
  • Posts 87
  • Location USA NC, USA
Offline
Basic
  • Joined Jun 2013
  • Posts 87
  • Location USA NC, USA
Offline
Link Posted: 9/26/2013 4:51:08 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By AR_George:
Thanks for the reply; that's encouraging. (I was worried about "egging" the hammer pin holes).

Can you estimate how many rounds you might have put through it?
View Quote

you could ramp the bolt to help with this, the 9mm AR is known for being hard on hammer pins . mine is on a rock river 9mm lower it has had over 2000 rounds through it and shows no ware on the hammer pins the bolt was ramped when it was built. but I do enjoy my 9mm AR and it is cheap to play with on the range as any AR gets
Member
Avatar
Bronze
  • Joined Mar 2009
  • Posts 15403
  • Location BRA BRA
Offline
Bronze
  • Joined Mar 2009
  • Posts 15403
  • Location BRA BRA
Offline
Link Posted: 9/26/2013 5:38:30 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By gunnut284:
When I had a 9mm upper I ran it on one of my CavArms lowers. Worked fine.
View Quote



The nice part about the CavArms or the new GWACS armory lowers, is that you can use the Hahn CavArms 9mm magblock which is VERY nice and fits the magwell like a glove.

http://shop.hahn-precision.com/Cavarms-MKII-9mm-Adapter-C9CRT1009.htm



All Colt upper. CavArms lower with Hahn magblock. Functions perfectly!




AUG > AR
Member
Avatar
Bronze
  • Joined Aug 2001
  • Posts 7013
  • Location USA FL, USA
Offline
Bronze
  • Joined Aug 2001
  • Posts 7013
  • Location USA FL, USA
Offline
Link Posted: 9/26/2013 5:45:15 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By maleante:



The nice part about the CavArms or the new GWACS armory lowers, is that you can use the Hahn CavArms 9mm magblock which is VERY nice and fits the magwell like a glove.

http://shop.hahn-precision.com/Cavarms-MKII-9mm-Adapter-C9CRT1009.htm



All Colt upper. CavArms lower with Hahn magblock. Functions perfectly!

http://i557.photobucket.com/albums/ss12/maleantemalandro/9mm%20AR/d95ceda7_zpsfba324ac.jpg

http://i557.photobucket.com/albums/ss12/maleantemalandro/wd1_zpsebb3e647.jpg
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By maleante:
Originally Posted By gunnut284:
When I had a 9mm upper I ran it on one of my CavArms lowers. Worked fine.



The nice part about the CavArms or the new GWACS armory lowers, is that you can use the Hahn CavArms 9mm magblock which is VERY nice and fits the magwell like a glove.

http://shop.hahn-precision.com/Cavarms-MKII-9mm-Adapter-C9CRT1009.htm



All Colt upper. CavArms lower with Hahn magblock. Functions perfectly!

http://i557.photobucket.com/albums/ss12/maleantemalandro/9mm%20AR/d95ceda7_zpsfba324ac.jpg

http://i557.photobucket.com/albums/ss12/maleantemalandro/wd1_zpsebb3e647.jpg


That does look nice. I just ran mine with the standard RRA block and didn't have any issues but the cam pin retention method didn't inspire confidence. I was always afraid it would crack the sonic weld on the front of the magwell (though it didn't).
-"The truth does not require your belief in it to function."
-Genuine science is about gathering evidence and testing the veracity of theories, not cheerleading for a particular ideology.
NRA Life Member
Avatar
Bronze
  • Joined Aug 2008
  • Posts 5445
  • Location USA FL, USA
Offline
Bronze
  • Joined Aug 2008
  • Posts 5445
  • Location USA FL, USA
Offline
Link Posted: 9/27/2013 4:23:58 PM EST
Poly lower is probably fine assuming all else is right.

Poly FCG can be problematic in some cases with 9mm builds. I found that out today the hard way. I tried a poly FCG from a NFA lower in a DDLES lower today and they are at least not compatible with my ramped bolt. Hammer sear would catch, but disco would not. I just wanted to find out if it would run.... and I found out

evl....
Can a 6.5" Saiga 12 reliably run cheap birdshot in MD-20 drums? This one can....

http://www.youtube.com/watch?v=kLovVj7k6LM
Basic
  • Joined Apr 2001
  • Posts 2369
  • Location USA AZ, USA
Offline
Basic
  • Joined Apr 2001
  • Posts 2369
  • Location USA AZ, USA
Offline
Link Posted: 10/2/2013 6:46:14 PM EST
Cavarms (or now Gwacs) is the only plastic lower I would own, much less use for 9mm. They are not the same as the plastic lowers that pretend they are the same as metal lowers.
Member
Avatar
Bronze
  • Joined May 2001
  • Posts 9591
  • Location USA AZ, USA
Offline
Bronze
  • Joined May 2001
  • Posts 9591
  • Location USA AZ, USA
Offline
Instructor
Link Posted: 10/2/2013 6:50:42 PM EST
[Last Edit: 10/2/2013 6:51:05 PM EST by SinistralRifleman]
Member
Avatar
Bronze
  • Joined May 2001
  • Posts 9592
  • Location USA AZ, USA
Offline
Bronze
  • Joined May 2001
  • Posts 9592
  • Location USA AZ, USA
Offline
Instructor
Link Posted: 10/2/2013 6:59:18 PM EST
[Last Edit: 10/2/2013 7:00:46 PM EST by SinistralRifleman]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By gunnut284:
That does look nice. I just ran mine with the standard RRA block and didn't have any issues but the cam pin retention method didn't inspire confidence. I was always afraid it would crack the sonic weld on the front of the magwell (though it didn't).
View Quote


The only mag wells that ever cracked were manufacturing defects from not being welded hard enough or the weld area was contaminated. If a receiver failed it did so almost immediately, not hundreds or thousands of rounds into its service life.

Where as CAV would run receivers once a year, GWACS runs them regularly so they have the vibration welding processes dialed in much better than we did at CAV Arms. The GWACS receivers are better made with better QA.


Firearms aficionado
Avatar
Bronze
  • Joined Nov 2008
  • Posts 4173
  • Location USA KY, USA
Offline
Bronze
  • Joined Nov 2008
  • Posts 4173
  • Location USA KY, USA
Offline
Link Posted: 10/3/2013 4:16:12 AM EST
My favorite 9mm AR was one I built with a Cav Arms lower. I used a RRA mag wel adapter which once adjusted ran 100%. That rifle was well balanced, light, and fit well. I sold off some of the upper parts but kept my Cav Arms lower. My only regret was not buying a couple more colors. Maybe I can add a FDE one later...I love the Cav lowers.

Do NOT compare the NFA or ATI or other plastic lowers to the Cav Arms (I now...they have a new name now...but I am old and just know Cav who developed them). The Cav Arms lower was designed to be made of the material it was produced in. They didn't do a copy of a lower designed for metal as they are two different materials with different properties. I do run a ATI Omni lower on a budget .22 build and for that use its OK. But NO WAY would I build a 9mm on the Omni, I think it would not withstand the beating. I could be wrong but ..... I don't want to take a chance.
An Army Veteran and proud of it. NRA Life member as we all should be.
Member
Avatar
Bronze
  • Joined Aug 2001
  • Posts 7032
  • Location USA FL, USA
Offline
Bronze
  • Joined Aug 2001
  • Posts 7032
  • Location USA FL, USA
Offline
Link Posted: 10/3/2013 4:32:09 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SinistralRifleman:


The only mag wells that ever cracked were manufacturing defects from not being welded hard enough or the weld area was contaminated. If a receiver failed it did so almost immediately, not hundreds or thousands of rounds into its service life.

Where as CAV would run receivers once a year, GWACS runs them regularly so they have the vibration welding processes dialed in much better than we did at CAV Arms. The GWACS receivers are better made with better QA.


View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SinistralRifleman:
Originally Posted By gunnut284:
That does look nice. I just ran mine with the standard RRA block and didn't have any issues but the cam pin retention method didn't inspire confidence. I was always afraid it would crack the sonic weld on the front of the magwell (though it didn't).


The only mag wells that ever cracked were manufacturing defects from not being welded hard enough or the weld area was contaminated. If a receiver failed it did so almost immediately, not hundreds or thousands of rounds into its service life.

Where as CAV would run receivers once a year, GWACS runs them regularly so they have the vibration welding processes dialed in much better than we did at CAV Arms. The GWACS receivers are better made with better QA.




That's good to hear. I was starting to use mine (which I picked up a while before) right around the time of the CavAid situation and a few cracked welds were being reported. Mine were much older, closeouts from Armalite, that I stuck in the back of the safe. I really like the CavArms lowers for a solid lightweight setup.
-"The truth does not require your belief in it to function."
-Genuine science is about gathering evidence and testing the veracity of theories, not cheerleading for a particular ideology.
Top