moroeder Posted January 10, 2015 Report Share Posted January 10, 2015 Hello from Indiana, Started hunting at the age of eight with my father as a great role model. Hunted until I was sixteen then started hunting girls instead of real game. I'm not positive but game over girls would have served me better. Didn't really learn how to aim my gun and keep the safety on untill I was ready to bag a trophy so there was too much time wasted in the field! Now retired and have decided to put some of my firearms back to work but mostly on problem animals like feral hogs and radical Islamists. The hogs are a lot easier to identify but I will keep my eyes open for any problem animal and I believe my .308 will satisfy my requirements. Not having an AR platform weapon my son introduced me to the AR15 he had built up from some sale items from Palmetto. Nothing against the .223 since I have a couple old school .223's (I even have one .225) but I reserve those for smaller animals. Always enjoyed the 30-06 I have more than the 30-30 or the .243 but once I fired an AR10 I was hooked! So for Christmas my son built me a bastard LR.308. he hadn't done his homework on the AR10 platform so he ended up with a bag of issues that I'm quietly working my way through. Still having issues with the assembly and will list them at the end of this intro and if anyone can help, please feel free to comment. Going to Texas next month for a couple of days of hog hunting on a relatives ranch outside San Antonio and want to take my .308 but still having issues. When I first received it the bolt to feed well engagement did not synchronise properly so I lightly feathered the flanks of the bolt spline teeth that were interfering. That gave me some relief but still had failure to feed and failure to eject issues on different loads. Changed out the BCG to a real DPMS to match the barrel and it does better but still has a failure to feed issue even on different loads. The bolt is moving in faster than the cartridge can be fed into the chamber. A bolt tooth will engage the cartridge above the extractor groove right on the 36 degree taper. That naturally locks the round in the chamber and places two dents in the case just below the 20 degree taper, caused by the feed well teeth. So where am I now? Don't know exactly what to do so I ordered a complete DPMS GenII SASS and should have it next week to hunt hogs with. Hopefully that rifle will operate properly! I don't have an adjustable gas block to see if I'm over gassing the carrier and causing the buffer to bounce off the bottom of the buffer tube. I'm not even positive of the spring or the buffer being correct. Buffer tube is 7" deep, spring 11" with .076" round wire and If I remember correctly the buffer is 3-1/4" long and the weight was close to what I found the DPMS buffer weight was supposed to be. I'm sure I have enough gas since the BCG locks open after last round, so what would you do? My next guess is to change out the buffer and spring or to change out to an adjustable gas block or both. Would like to do one at a time. Would one of the newer hydraulic buffers be a better change out than going to an OEM DPMS spring and buffer? I could put some prussian blue on the nylon tip of the buffer I have and see if it is bottoming out, I think the collapsed spring height is less than the buffer but not positive at this point. Anyway, I'm glad there is a forum for the .308 since it is an exceptional caliber. Hopefully I didn't overkill my intro with questions (I have tried to find answers in the forum.) Being a retired mechanical engineer and still designing special machinery in my shop I can do some work on my personal arms but would prefer doing what's correct and not wasteing megabucks on minibuck problem solving! Thanks for your time, if you got this far. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted January 10, 2015 Report Share Posted January 10, 2015 Welcome from Indiana brother,I'm in the nothwest corner how about you ? Quote Link to comment Share on other sites More sharing options...
wetncold Posted January 11, 2015 Report Share Posted January 11, 2015 Sounds to me like you need a heavier spring. But I am no expert on the AR-10. Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted January 11, 2015 Report Share Posted January 11, 2015 I would start with a recoil spring, either an Armalite AR10 spring or a Chrome Silicon flat-wound spring would serve you well. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 11, 2015 Report Share Posted January 11, 2015 I would start with a recoil spring, either an Armalite AR10 spring or a Chrome Silicon flat-wound spring would serve you well. +1, and they only cost $15-$25 Quote Link to comment Share on other sites More sharing options...
Rsquared Posted January 11, 2015 Report Share Posted January 11, 2015 +2. I agree with the spring swap. After that we can move on to buffers and/or different blocks. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted January 11, 2015 Report Share Posted January 11, 2015 Welcome from AZ! Quote Link to comment Share on other sites More sharing options...
Pranavdc Posted January 11, 2015 Report Share Posted January 11, 2015 http://heavybuffers.com/ar10carbine.html Take a look at the link above. He offers a special ar 308 spring with his buffer or you can get his spring that he has made specific for 308s. Quote Link to comment Share on other sites More sharing options...
moroeder Posted January 11, 2015 Author Report Share Posted January 11, 2015 Thanks for the input. I watched the YouTube on the flat wound spring and found it very interesting. At a 16# load when carrier locked open vs the 22# normal .308 carbine spring I think I will go for the flat spring first. That should slow down the carrier a tad bit and hopefully allow the cartridge to enter the chamber before contact. Then I'm going to modify my gas block so I can tune the amount of gas going down the tube if needed. Unforgiven, I'm just west of Indy about thirteen miles outside the loop. Far enough to be safer from the AK's but they are spreading out like a fungus. Now that heroine is cheaper and more available than oxycontin the druggies are expanding their market reach. So as any good citizen, I'm prepared as I can be and ready to protect person and property from any uninvited guests. Quote Link to comment Share on other sites More sharing options...
Pranavdc Posted January 11, 2015 Report Share Posted January 11, 2015 Thankful I am in the hills south of Bloomington! I don't envy anyone close to any large city and avoid Indy like the plague! The folks down my way love the smell of spent gun powder! Let us know how things come out with your spring. I am going with a hydraulic buffer to start with and then the one I linked if the hydro isn't what it's supposed to be. Cheers! Quote Link to comment Share on other sites More sharing options...
Microgunner Posted January 11, 2015 Report Share Posted January 11, 2015 Welcome from Florida. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted January 12, 2015 Report Share Posted January 12, 2015 Brrother moroeder,I'm in Lake county near Ill. border.Still work in Ill.Yea Indy is sketchy watch you'r six. Brother Pranavdc Bloomington is a nice town,fished Lake Monroe. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 12, 2015 Report Share Posted January 12, 2015 Buffer tube is 7" deep, spring 11" with .076" round wire and If I remember correctly the buffer is 3-1/4" long and the weight was close to what I found the DPMS buffer weight was supposed to be. That's an AR-15 buffer length. Not gonna work in a DPMS-based .308 AR. That's the bulk of your problems, right there. Quote Link to comment Share on other sites More sharing options...
moroeder Posted January 18, 2015 Author Report Share Posted January 18, 2015 I love my new DPMS LR.308 GENII SASS, twenty rounds on a cold day with two different loads it acted just like I expected, excellent. This is my backup for the original .308 my son put together for me as a Christmas present (my first post.) Because of my planned hog hunting for next month and the issues I was having with the first bastard .308 I bit the bullet and purchased the full DPMS unit. The bastard .308 that I was having trouble with the failure to feed properly i.e., bolt closing on cartridge too early has been re-engineered by adding the flat wound spring from Tubb, replacing the bastard BCG with an authentic DPMS GEN I BCG and I modified the gas block so I could adjust how much gas entered the tube. The new spring and new BCG didn't help, about 25% reduction of gas flow made it work fine! Cycled perfect with two different loads. However did I say bastard? Since I'm new to the LR, AR and all the aftermarket manifestations, I don't know what I have! Sure would be nice for someone that's been through the mill to list, I mean write a book on how to properly build a bastard .308 rifle with proven success. It would sure be nice to be able to pick and choose different parts and combine them into a fully functional weapon. My son's only build from "on sale" parts from Palmetto was a 5.56 and worked like a charm from the get go! Now he and I both know the .308's are a totally different bag of tricks! 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.