ScrubLord Posted November 30, 2022 Report Share Posted November 30, 2022 Hey hows everybody doing? I decided I wanted to get into shooting .308. Ive never had one before or built anything other than a few glocks. But I am an engineer, have designed and built houses, cars etc…. So I figured wtf how hard could it be to throw together a lr 308? I thought it went smooth, until I got everything together and tried to hand cycle a few rounds. First rack chambered a round perfectly, bcg went into battery, everything was fine. I pulled the charging handle, it ejected beatifully…. But then the next round chambered half way. The bolt wasnt fully closed and no mattery what I did, the round wouldnt seat properly or eject. I hand to take the upper off of the lower and pull the round out. Heres the parts List: -Aero M5e1 upper & lower with 15” enhanced handguard -Aero LPK minus FCU & Bolt catch -B.A.D. Extended lr 308 bolt catch -Geissele SSA-E Lightning Bow -Aero m5 nickel boron BCG -Aero m5 enhanced carbine length buffer system -Radian Raptor ar10 charging handle -18” spikes/fn .308 chf cl barrel (although its stamped 7.62, spikes says both are guaranteed by fn) -Superlative arms .750 adjustable gas block -Spikes proprietary length gas tube -Precision Armament EFAB (with pa crush washer) -Magpul UBR gen 2 stock -Midwest 30mm qd scope mount -Trijicon accupoint tr26 2.5-12.5x green moa -Arisaka 35deg offset mount -Holosun 508t red dot -Magpul MBUS front and rear flip ups -DD enhanced vfg -Magpul bi pod -Lancer L7awm 10rd trans smoke mag Everything was put together with proper tools, torqued to spec and lubed better than an elizabeth nj escort. I would just appreciate a little input as to whether this is something I should be worried about (like take to a gunsmith to get a green light). I’ve read that lr 308 builds have a pretty extensive breaking in time. Ive now tried hand cycling it 4 times, and after the first round cycles perfectly, the second always does the same thing. Thanks for your guys help. Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted November 30, 2022 Report Share Posted November 30, 2022 Are you riding the charging handle, or are you slingshotting it? Quote Link to comment Share on other sites More sharing options...
ScrubLord Posted November 30, 2022 Author Report Share Posted November 30, 2022 I tried both, same result. Its almost like the rim of the cartridge is dragging (federal vital shoks 155gr) Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted November 30, 2022 Report Share Posted November 30, 2022 How many rounds do you have in the mag when hand cycling? I am asking to see if it is one side of the mag that hangs up each time, left or right. Try an even and odd number of rounds in the mag to see if it still happens on the second round or if it is one side of the mag causing the problem. Quote Link to comment Share on other sites More sharing options...
ScrubLord Posted November 30, 2022 Author Report Share Posted November 30, 2022 9 minutes ago, Armed Eye Doc said: How many rounds do you have in the mag when hand cycling? I am asking to see if it is one side of the mag that hangs up each time, left or right. Try an even and odd number of rounds in the mag to see if it still happens on the second round or if it is one side of the mag causing the problem. Huh, thats a good idea I wasnt even thinking about the mag. Im going to try what you said when I get home and see what happens. Thanks Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted November 30, 2022 Report Share Posted November 30, 2022 Also, if that's soft-nosed hunting ammo, that could be the source of the issue.... Soft points are a toss up when it comes to reliable feeding. Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted November 30, 2022 Report Share Posted November 30, 2022 5 minutes ago, Matt.Cross said: Also, if that's soft-nosed hunting ammo, that could be the source of the issue.... Soft points are a toss up when it comes to reliable feeding. I thought that as well. I looked up Vital Shok. It is a solid copper round. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 30, 2022 Report Share Posted November 30, 2022 (edited) You haven't fired the gun yet - and DON'T. You've only hand-cycled a couple rounds. Don't shoot it. I'll be back with parts quotes from you, and explanations on "why don't fire it." If you shoot it, you'll fuk it up. Edited November 30, 2022 by 98Z5V Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 30, 2022 Report Share Posted November 30, 2022 (edited) 3 hours ago, ScrubLord said: I would just appreciate a little input as to whether this is something I should be worried about (like take to a gunsmith to get a green light). I’ve read that lr 308 builds have a pretty extensive breaking in time. Ive now tried hand cycling it 4 times, and after the first round cycles perfectly, the second always does the same thing. Thanks for your guys help. 1st round is always from the right side of the mag, so 2nd round would be from the left side of the mag. This tells me that it's not the face of your ejector. Square-faced ejectors have issues with rounds from the right side of the magazine. Not the left side of the magazine. Based on the mags you're using, I know how the stack is in those mags. My bottom line, jumping ahead - is don't worry how a brand new build hand-cycles rounds. Shoot the gun. Worry about how the gun SHOOTS, not hand-cycles rounds. But, that's jumping ahead. 3 hours ago, ScrubLord said: -Magpul UBR gen 2 stock Nice - built with a built-in 7 5/8" internal depth receiver extension in the stock, so it can run AR15s with VLTOR A5 recoil systems, and .308ARs with proper, Armalite AR-10 Carbine Recoil Systems. 3 hours ago, ScrubLord said: -Aero m5 enhanced carbine length buffer system ...and this is a recoil system in a package, that's (#1) too light of a buffer, at 3.8oz (H1 buffer), and (#2) designed to run in a 7.000" internal depth extension (AR15 carbine extension). So, how did you set the UBR 2 up? You insert that spacer that's inclided with it, then the spring, and then buffer? This is very important information, that you need to provide here... 3 hours ago, ScrubLord said: -18” spikes/fn .308 chf cl barrel (although its stamped 7.62, spikes says both are guaranteed by fn) Need specific details on this barrel configuration. 18". Got it. 0.750" gas block journal diameter (got that from your gas block information). What's the gas system close to? Below, you state it's a proprietary gas tube from Spike's. How long is that gas tube? Is this something longer than midlength? Something shorter or longer than rifle length? 3 hours ago, ScrubLord said: -Spikes proprietary length gas tube How long is that gas tube? The important parts here are two or three things - besides the trigger hasn't been pulled on a live round yet. Recoil system - the buffer is going to be too light, the spring is questionable. Not good parts, for a .308AR, even though it came straight from Aero. The gas port diameter is imperative, as well as the gas system length. I can figure everything out, with those details. If you set this gun up with that UBR 2, and those recoil system parts, and you didn't include that 5/8" spacer in the bottom, you'll damage the ears on your lower receiver if you shoot this gun in that configuration... Your BCG will smash the shiit out of your lower, first time a live round touches off... Edited November 30, 2022 by 98Z5V Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 30, 2022 Report Share Posted November 30, 2022 (edited) 3 hours ago, ScrubLord said: But I am an engineer, have designed and built houses, cars etc…. So I figured wtf how hard could it be to throw together a lr 308? No offense intended, but these aren't houses, cars (unless you're building high performance engines and into tuning the volumetric efficiency of each cylinder, as in modern computer-software tuning nowadays, hacking ECMs in cars to make them "better"). <<< Yes, I do this. This isn't setting up pinion bearing preload or backlash on a ring gear, building a differential. These things are like comparing those skills - to comparing apples and hammers. Guns aren't the same, and gas-guns are vastly different than any other guns. Sprinco states it best. They make the broadest range if the highest quality recoil springs of anyone else in the gun industry. Here's how they break it down, right on their website: WHAT SPRING DO I NEED TO ORDER? READ THIS BEFORE CALLING Unless you already know which spring you need for your rifle, please refer to the following resources before calling for a recommendation. If you call prior to knowing the answer to the specific current performance of your rifle, you will be referred back to this request to provide results. If you haven't built or shot it yet, neither one of us can predict the outcome. Bottom line is this - if you've only hand-cycled rounds into a chamber at this point - then we can't help diagnose anything with the gun. There are no "performance metrics" that can be applied here. We have no idea what your gun is gonna do when you fire it, until you fire it. I've outlined some things that concern me with the build, so address those - answer the questions I asked, and I can give you an idea of what's gonna happen... Until then, though... Hand-cycling rounds isn't gonna give you a single clue about how that rifle will perform, when you pull the trigger on a live round... That's my $0.02 on it. Edited November 30, 2022 by 98Z5V Quote Link to comment Share on other sites More sharing options...
ScrubLord Posted December 1, 2022 Author Report Share Posted December 1, 2022 On 11/30/2022 at 1:14 AM, 98Z5V said: No offense intended, but these aren't houses, cars (unless you're building high performance engines and into tuning the volumetric efficiency of each cylinder, as in modern computer-software tuning nowadays, hacking ECMs in cars to make them "better"). <<< Yes, I do this. This isn't setting up pinion bearing preload or backlash on a ring gear, building a differential. These things are like comparing those skills - to comparing apples and hammers. Guns aren't the same, and gas-guns are vastly different than any other guns. Sprinco states it best. They make the broadest range if the highest quality recoil springs of anyone else in the gun industry. Here's how they break it down, right on their website: WHAT SPRING DO I NEED TO ORDER? READ THIS BEFORE CALLING Unless you already know which spring you need for your rifle, please refer to the following resources before calling for a recommendation. If you call prior to knowing the answer to the specific current performance of your rifle, you will be referred back to this request to provide results. If you haven't built or shot it yet, neither one of us can predict the outcome. Bottom line is this - if you've only hand-cycled rounds into a chamber at this point - then we can't help diagnose anything with the gun. There are no "performance metrics" that can be applied here. We have no idea what your gun is gonna do when you fire it, until you fire it. I've outlined some things that concern me with the build, so address those - answer the questions I asked, and I can give you an idea of what's gonna happen... Until then, though... Hand-cycling rounds isn't gonna give you a single clue about how that rifle will perform, when you pull the trigger on a live round... That's my $0.02 on it. Hey, no offense taken. Thats my downfall with everything in life. Every year around christmas, this mentality get me humbled. Last year it was by a bouncer at the bar. I said to myself, “thats a big dude, but I bet I could whip his ass up and down the street”. I woke up 2 minutes later staring into the night sky…. But anyway, I appreciate all the good info. It turns out Armed Eye Doc was correct. That left feed lip was slightly bent during shipping on the Lancer Mag. Also after playing around with your breakdown of my parts, and shooting the rifle, your point on the ubr tube was somewhat helpful. It ran like a champ, but the tube was definitely hindering performance. I now have a PRS lite with the Aero M5e carbine buffer set up back. It is a great gun. I was also able to shoot someones scar and FAL when at the range, and I feel like my Aero blew them put of the water with accuracy and recoil. Thanks again everybody. I appreciate all of your help! Quote Link to comment Share on other sites More sharing options...
ScrubLord Posted December 1, 2022 Author Report Share Posted December 1, 2022 Also, everybody says the same thing you guys said about soft points…. Keep them for a bolt gun. Ive not had problems with them as of yet. But ive only got 250rds through it 40 of which were sp. but man I love that barrel/ebr combo Quote Link to comment Share on other sites More sharing options...
dpete Posted December 3, 2022 Report Share Posted December 3, 2022 The soft points do work in an AR but you have to be able to accept that the tips get dinged by the feedramps. Being soft points they are hunting rounds. If your hunting distances are short, say 100 yards and in, use them. My handload sp bullets were about moa accurate at 100 yards. Quote Link to comment Share on other sites More sharing options...
DNP Posted December 3, 2022 Report Share Posted December 3, 2022 That would be a fun test at the range down the road. Carefully hand feed soft points one by one for a group at 100 and 200, then auto feed for another set of groups and compare. Quote Link to comment Share on other sites More sharing options...
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