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KWA LM4 PTR, a gas blowback rifle, 9" Larue RIS, Elite Force Flip-Up Sights, Voodoo Tactical Matrix Pack
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
When I first got the new KWA LM4 PTR, a gas blowback rifle, from Pyramyd Air, the first thing I wanted to do after test firing it was to get rid of that boring front handguard and put a sweet rail system on there.  Well, while I was extremely impressed with the accuracy of the LM4, I was extremely disappointed with how difficult it was to get the rail system on there, specifically getting the delta ring to screw all the way onto the threads of the LM4 upper.  The circumference of the threads on the LM4's upper was just a tad too large, partly due to the paint.

Click here to see how I resolved the issue after the jump...



I tried the rail's delta ring on a couple of the m4 AEG uppers I had sitting on my workbench and had zero issues.  It screwed on easily with each of the AEG uppers.  So I knew that it wasn't necessarily an issue with my delta ring size.

Luckily, I was whining about my problems to my buddy, Jake, who immediately suggested that I use a wire-wheel Dremel bit to the threads to remove the paint and a bit of the metal material to allow the delta ring to screw on all the way.

Dremel rotary tool with wire brush bit
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
Here's a shot of what the threads looked like after just trying to screw on the delta ring before applying the wire wheel to them.  The very astute will notice that this is not a photo of the LM4 upper, but the threads looked almost identical.  Truth be told.  I can be a real idiot sometimes.  I thought I was photographing the LM4's upper, but I had grabbed one of the AEG uppers on the work bench sitting right next to it. 
Airsoft M4 upper receiver, before.
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
Now, here's a shot of what the threads look like with all the paint, dirt & debris removed thanks to that handy little wire brush. 
Airsoft M4 upper receiver, after.
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
I also applied the wire brush to the inside of the delta ring to clean that up a bit as well.
Delta ring threads for a knock-off 9" Larue RIS for the KWA LM4 PTR.
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
With the help of an AR15 wrench, I was able to screw the delta ring all the way onto the LM4's upper receiver to keep the outer barrel from wobbling.  I installed the rest of the parts and voila...a pretty good looking setup!   
KWA LM4 PTR, a gas blowback rifle, 9" Larue RIS, Elite Force Flip-Up Sights, Voodoo Tactical Matrix Pack
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
I also added an Elite Force stubby vert grip, some CA rail covers and the new Elite Force Flip-Up Sights.  I figured my Voodoo Tactical Matrix Pack would make a handy tool to prop the LM4 up with as well.
KWA LM4 PTR, a gas blowback rifle, 9" Larue RIS, Elite Force Flip-Up Sights, Voodoo Tactical Matrix Pack
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog

KWA LM4 PTR, a gas blowback rifle, 9" Larue RIS, Elite Force Flip-Up Sights, Voodoo Tactical Matrix Pack
Airsoft photo by Tom Harris for the Pyramyd Airsoft Blog
Don't think that I won't be covering the performance of the KWA LM4 PTR.  I'm just waiting for the King Arms M4 GBBR to arrive later this week to do a comparison review.  I'll also be including the G&P WOC GBBR's performance in there as well.  Have a happy 4th of July.  Stay safe and don't blow your trigger finger off with fireworks. 

AIRSOFT JOB OPPORTUNITY ALERT: Pyramyd Air is looking for enthusiastic individuals who have a good knowledge of Airsoft products to help them assist their customers while shopping at www.PyramydAir.com.  You'll get paid to talk about Airsoft stuff AND you can do it from the comforts of your own home!  Click the following link to register with Needle and get all the details.  https://pincushion.needle.com/needlers/register/pyramydair 
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