trouble Posted February 6, 2014 Share Posted February 6, 2014 I built my first rifle using a 18" barrel with rifle gas. It seems to run very slow compared to all the carbine and mid gas guns I have. It does not short stroke, and it locks open on a empty mag. The rifle runs fine it just seems to run slow like I am waiting for the bolt to close to get the next shot off. Is it just the way rifle gas runs or is it just a diffrent impulse feel? Or is it just me. Any opinions or help on this would be great. Thanks Quote Link to comment Share on other sites More sharing options...
usmc1094 Posted February 6, 2014 Share Posted February 6, 2014 You shouldn't have to wait to get the next shot off. If its working as it should, and it sounds like it is, maybe its just a different feel from what you normal shoot. How much lube are you using on the bolt carrier? Quote Link to comment Share on other sites More sharing options...
trouble Posted February 6, 2014 Author Share Posted February 6, 2014 (edited) Bolt carrier is well lubed. Not dripping wet. It seems to recoil different. Kinda hard to explain but the recoil just feels slow. Edited February 6, 2014 by trouble Quote Link to comment Share on other sites More sharing options...
Flatland Shooter Posted February 6, 2014 Share Posted February 6, 2014 (edited) Could it be its just smoother with the rifle length gas tube versus the mid-length and carbine tubes you are accustomed to? That's one of the goals attained by running the rifle length tube. Edited February 6, 2014 by Flatland Shooter Quote Link to comment Share on other sites More sharing options...
DDustin Posted February 6, 2014 Share Posted February 6, 2014 My recent build was under gassed and felt just like this. It didn't start short stroking unless it got dirty but my rate of fire was noticeably slower and you could actually see the bolt carrier moving a tad bit slower in videos. I just had the gas port opened up a little bit and it was back to the way it was before I swapped barrels. You could also check the gas block alignment and the gas port for burs. Quote Link to comment Share on other sites More sharing options...
HRider Posted February 7, 2014 Share Posted February 7, 2014 Can you outrun the gun? If you can't outrun it with your splits, enjoy the smoother operation. It should shoot flatter (have less muzzle movement) than a mid or carbine length system. Hurley Quote Link to comment Share on other sites More sharing options...
trouble Posted February 7, 2014 Author Share Posted February 7, 2014 Actually I can out run the gun and I am not a very fast shooter. Quote Link to comment Share on other sites More sharing options...
openclassterror Posted February 7, 2014 Share Posted February 7, 2014 I would try it on another lower, which will narrow it down to a buffer/spring issue or an upper problem. If it runs slow on another lower, then look for friction in the top half. Full weight carrier, semi carrier, or lightweight? Brand new bolt/ carrier assembly? Sometimes a rough finish in the carrier bore or the cam slot slows unlocking. Some lower and bolt carrier combinations allow pmags to drag on the bottom of the carrier. That's easy to check by swapping in a forged alum mag. How easily does the carrier slide in the upper when you aren't compressing the buffer? There are a number of possible causes that aren't gas related. I had one brand new rifle come in that still had glass beads floating around in the upper from before anodizing! Made it all the way through final assembly without ever being rinsed out. Major name brand too! You could watch the bolt open and close, but it still cycled. Operating speed doubled after a thorough cleaning. Also I agree with Ddustin about checking gas port alignment and debris/ burrs. What is gas port dia? Also, what bullet weight? Quote Link to comment Share on other sites More sharing options...
Mike_M Posted February 7, 2014 Share Posted February 7, 2014 What BCG? Is it new and coated (NiBo)? What stock? I agree with swapping the parts with your other guns to see if you can isolate any differences related to different stock/buffer, different BCG, etc. -Mike Quote Link to comment Share on other sites More sharing options...
HRider Posted February 7, 2014 Share Posted February 7, 2014 There is a binding/friction problem somewhere. Start looking for signs of rubbing on any mating surfaces. The bolt carrier should slide freely in the upper (with the rear pin out and the rifle opened up or the upper removed from the lower). If it has that much drag and still cycles, I believe that you are getting enough gas to run the gun, so it shouldn't be gas related. What buffer/spring/tube combo are you using? How does it feel when you just cycle the bolt with the charging handle? Hurley Quote Link to comment Share on other sites More sharing options...
trouble Posted February 7, 2014 Author Share Posted February 7, 2014 Bolt and bolt carrier has the nib coating. Everything seems to slide fine and free when cycled by hand. Using a carbine 6 position carbine buffer assembly. Not sure on buffer weight or spring rate though. Quote Link to comment Share on other sites More sharing options...
fastshooter03 Posted February 8, 2014 Share Posted February 8, 2014 What's the ammo? If you're using a slow burning powder that is lightly loaded it can feel slow. Nick Quote Link to comment Share on other sites More sharing options...
Mike_M Posted February 8, 2014 Share Posted February 8, 2014 Try a different BCG. I have heard from multiple sources that a NiBo coated BCG seem to require a break-in period. I have been having trouble with a new rifle build and it ran like a champ with a borrowed uncoated BCG. Put my NiBo BCG back in and the troubles come back. Sounds like you have other rifles you can rob one from? I played around with some different buffers, but if I can't get mine to run, my NiBo bolt is going back... -Mike Quote Link to comment Share on other sites More sharing options...
trouble Posted February 8, 2014 Author Share Posted February 8, 2014 Running reloads. Not loaded hot, but never a problem from any other rifle. I will try a different bolt carrier tomorrow and see if it makes a difference. Quote Link to comment Share on other sites More sharing options...
fastshooter03 Posted February 9, 2014 Share Posted February 9, 2014 What powder, charge weight, bullet, etc? Quote Link to comment Share on other sites More sharing options...
twodownzero Posted February 10, 2014 Share Posted February 10, 2014 What powder, charge weight, bullet, etc? That's what I'd want to know. It sounds like ammo to me. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.