carbon9 Posted August 19, 2012 Report Share Posted August 19, 2012 Hi, this will be my first AR-308 build and knowing there may be possible combinations which do not play well together I am appealing to you, the experienced, for critiques or suggestions before I start assembly. I have everything on my list except the barrel which should come back any day now.Thank you.This build will be simply for fun and maybe minor Heavy Metal Competition.Sun Devil Billet Upper and LowerCriterion 20" M118 SS (1-12) barrel sent off to ADCO for reprofiling and cutting. .825 under the handguard and .750 from gas block forward, cut, threaded and crowned for a barrel length of 16.75" w/rifle length gasFirebird Precision LoPro SS Gas Block, the only gas block I know of designed to mount directly against the gas block shoulder(ingenius), Syrac or JP A2 style adjustable gas block/sight for a dissipator style build.SJC Titan compCarbon Arms AR-308 15" Carbon Fiber handguard w/barrel nutJP LMOS .308 complete carrierBCM 4 .308 charging handleJP SCS buffer/spring-Silent Captured SpringSR Gold TriggerMagpul UBR Stock and MIADI am still trying to figure out which safety I am going to run as I need it to go back on safe with minimal effort when dumping the gun.Thank you again for your input. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted August 19, 2012 Report Share Posted August 19, 2012 <munch> Quote Link to comment Share on other sites More sharing options...
survivalshop Posted August 19, 2012 Report Share Posted August 19, 2012 Hi, this will be my first AR-308 build and knowing there may be possible combinations which do not play well together I am appealing to you, the experienced, for critiques or suggestions before I start assembly. I have everything on my list except the barrel which should come back any day now.Thank you.This build will be simply for fun and maybe minor Heavy Metal Competition.Sun Devil Billet Upper and LowerCriterion 20" M118 SS (1-12) barrel sent off to ADCO for reprofiling and cutting. .825 under the handguard and .750 from gas block forward, cut, threaded and crowned for a barrel length of 16.75" w/rifle length gasFirebird Precision LoPro SS Gas Block, the only gas block I know of designed to mount directly against the gas block shoulder(ingenius), Syrac or JP A2 style adjustable gas block/sight for a dissipator style build.SJC Titan compCarbon Arms AR-308 15" Carbon Fiber handguard w/barrel nutJP LMOS .308 complete carrierBCM 4 .308 charging handleJP SCS buffer/spring-Silent Captured SpringSR Gold TriggerMagpul UBR Stock and MIADI am still trying to figure out which safety I am going to run as I need it to go back on safe with minimal effort when dumping the gun.Thank you again for your input.I think all of the ones I have put on , butt right up to the shoulder . I'm sure there are some out there that don't though.B.A.D . safetiesInteresting barrel modifications. There are people that say a 16" bbl. & rifle length gas system won't work . Strange , mine works . <munch> Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted August 20, 2012 Report Share Posted August 20, 2012 Just a heads up , if you haven't purchased the upper then you might want to wait for the Sun Devil side charging upper for the 308. Quote Link to comment Share on other sites More sharing options...
carbon9 Posted August 20, 2012 Author Report Share Posted August 20, 2012 survivalshop. I was under the impression most gas blocks needed .030" space from the shoulder to allow the old non-freefloat/delta handguard mount, an antiquated idea in my opinion. When was the last time you really saw or kept a non free float handguard? I like the BAD safeties but have seen so many fitment issues with the SR Gold in what little research I have done. Maybe I will try one after all, I'll give them a call tomorrow. I went with the 16.75" barrel length to allow any front iron sight combo I may wish to run in the future for 400yd and less courses. Had to keep the rifle length gas and I wanted the 1-12 twist for all the 110gr and 125gr bullets I will be using for Heavy Metal. I did hear Fulton Armory is working on another 16" .308 Criterion barrel in a lightweight profile, not sure of the gas length or twist, couldn't wait that long :D. Yes, I am envious of your 16" barrel ;D MikedaddyH.Any firm ETA on the SD side charging upper? That is something I would really like to see first. I'm sure Dave would let me exchange my upper towards the new one if I haven't built it yet. Of course, my lack of patience will probably force me to build one of each.Thank you for all the info and guidance. Also, has anybody owned and/or used a UBR and an ACS-L at the same time? What is the cheek weld difference or similarity between the two? I run UBRs and a PRS on my ARs . I actually like the UBRs best but am thinking a UBR with the JP SCS might be a little buttstock heavy and an ACS-L with the JP SCS might give me the same weight as a UBR with standard spring and buffer. Technically, I should just run the UBR I already have and see how it goes. Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted August 21, 2012 Report Share Posted August 21, 2012 News flash...Dave doesn't run the shop ,he has a day job. Anita would sell you a second upper receiver ..no problem. Besides with a extra upper receiver you could start the next gun ! Ya thats how it starts <lmao> Quote Link to comment Share on other sites More sharing options...
carbon9 Posted August 21, 2012 Author Report Share Posted August 21, 2012 News Flash, really? Funny, I've always dealt directly with Dave on the SD-15 receiver sets I have bought and built in the past. But then I do see how an engineer/designer/machinist who still helps with his father's/family business would have somebody good with books and people run the front. I see him and Anita fairly often as they live a few doors down from my mother so I am sure either one of them will help me out with the exchange or additional purchase. I was hoping you would be more knowledgeable and have an actual ETA on the side charging upper so I wouldn't have to bug Dave with how busy he is. Thank you anyways for your help. Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted August 23, 2012 Report Share Posted August 23, 2012 The side charging upper prototype is built , thats all I can say. I dont have any info on it. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted August 23, 2012 Report Share Posted August 23, 2012 survivalshop. I was under the impression most gas blocks needed .030" space from the shoulder to allow the old non-freefloat/delta handguard mount, an antiquated idea in my opinion. When was the last time you really saw or kept a non free float handguard? I like the BAD safeties but have seen so many fitment issues with the SR Gold in what little research I have done. Maybe I will try one after all, I'll give them a call tomorrow. I went with the 16.75" barrel length to allow any front iron sight combo I may wish to run in the future for 400yd and less courses. Had to keep the rifle length gas and I wanted the 1-12 twist for all the 110gr and 125gr bullets I will be using for Heavy Metal. I did hear Fulton Armory is working on another 16" .308 Criterion barrel in a lightweight profile, not sure of the gas length or twist, couldn't wait that long :D. Yes, I am envious of your 16" barrel ;D MikedaddyH.Any firm ETA on the SD side charging upper? That is something I would really like to see first. I'm sure Dave would let me exchange my upper towards the new one if I haven't built it yet. Of course, my lack of patience will probably force me to build one of each.Thank you for all the info and guidance. Also, has anybody owned and/or used a UBR and an ACS-L at the same time? What is the cheek weld difference or similarity between the two? I run UBRs and a PRS on my ARs . I actually like the UBRs best but am thinking a UBR with the JP SCS might be a little buttstock heavy and an ACS-L with the JP SCS might give me the same weight as a UBR with standard spring and buffer. Technically, I should just run the UBR I already have and see how it goes.It is my experience that most gas blocks ( non A2 front sight types ) do not allow for the spacing for the A2 hand guard end cap . I measure all the gas blocks I install for gas port placement & if you take it for granted that you can adj. them for that gap , you may be partially blocking the barrels gas port , which may hinder rifle action function .A proper size drill bit & a dial caliper to measure the distance from the drill bit to the shoulder & same for the gas block , measure from the shoulder seating end ,to the drill bit placed into the gas port of the gas block & you will know if you can leave that gap or not .Most gas block ports are larger in dia. than there corresponding port in the barrel & may be able to work with out any function problems , but you never know .Range reports please. I do like my 16" 308 , just too busy with every one elses rifles to enjoy her enough . Quote Link to comment Share on other sites More sharing options...
carbon9 Posted August 24, 2012 Author Report Share Posted August 24, 2012 Good routine and method, I will be adopting both in the future. I think your technique should be added to this sticky http://308ar.com/forum/index.php?topic=3312.0 as another tool for better gas block installation.Thank you Quote Link to comment Share on other sites More sharing options...
carbon9 Posted August 25, 2012 Author Report Share Posted August 25, 2012 My barrel returned from ADCO today, amazingly quick, great service and nice work. The barrel left weighing 3.55lbs and came back weighing 2.582lbs. The Titan comp, Syrac gas block, gas tube, barrel and 15" Carbon Fiber handguard weigh 3.83lbs combined. Not super light but very manageable. Now to find time to build it..... Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted September 5, 2012 Report Share Posted September 5, 2012 Went to Quentin Defense and looked at the slick side 308 upper and it is in production now ! This fits the Sun Devil Lower receiver and the DPMS lower receiver, has extra beveling around the charging handle mouth area. <thumbsup> The side charging 308 upper is still in the R & D stage with the prototype. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted September 5, 2012 Report Share Posted September 5, 2012 http://axtsweapons.com/products/AX762 Been waiting for these guys WTF. :drool: Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted September 5, 2012 Report Share Posted September 5, 2012 http://axtsweapons.com/products/AX762 Been waiting for these guys WTF. :drool:I know what mean. Waiting for my Dane Armony version of the QD 308 lower receiver.I'm going to do a #11 and #24 theme guns ! Quote Link to comment Share on other sites More sharing options...
unforgiven Posted September 6, 2012 Report Share Posted September 6, 2012 Checked out that link brother Mike liked the hi power setup. <thumbsup> Quote Link to comment Share on other sites More sharing options...
carbon9 Posted September 7, 2012 Author Report Share Posted September 7, 2012 The AXTS Weapons stuff looks really nice.If I get off work in time I'm gonna try to get this thing built tonight, lower is already done just have to finish the upper. If I don't run into any issues I will try to get range time with it tomorrow. I will post updates as I can. Quote Link to comment Share on other sites More sharing options...
carbon9 Posted September 8, 2012 Author Report Share Posted September 8, 2012 Dave and I finished it up last night, turned out very nice. Went to the range this am to meet some friends and sight in, so much rain we didn't even fire a shot!!! Looks like I'll be using the .223 for the Annual Rio 3gun Team Match tomorrow:( 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.