Jephthah Posted August 3 Report Share Posted August 3 My .308 rifle is cycling flawlessly with 168 grain and above ...however I purchased plenty rounds at 150 ish during the lockdown that do not seem to like my homebuilt. I purchased completed upper from reputable source. Also purchased larger / heavier buffer from Cliff @ heavy buffers and only concern is why not performing with lower grain ammo. Mahalo for your feedback in advance, Aloha, Jeff Quote Link to comment Share on other sites More sharing options...
shooterrex Posted August 3 Report Share Posted August 3 Hi, how are we supposed to be able to help you without exact details. List everything about your rifle. Who made what parts. Search for the waterboarding thread. That will give you a idea of the level of information we need to help you fix your rifle over the internet from miles away. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 3 Report Share Posted August 3 8 hours ago, Jephthah said: Also purchased larger / heavier buffer from Cliff @ heavy buffers and only concern is why not performing with lower grain ammo. Your gas port is undersized, or your gas system is completely out of spec. Like Rex stated above - we have nothing to go on, with the lack of details. You said that you built this gun - we need the parts breakdown, in order to CSI something like this over the internet, working with typed words. Here's the level of detail needed: P.S. It's "Clint" at HeavyBuffers... Not "Cliff..." Quote Link to comment Share on other sites More sharing options...
Jephthah Posted August 4 Author Report Share Posted August 4 That is correct... Clint @ Heavy Buffers...my bad... regarding specs on my .308 I did not build this gun ... I mentioned "home built" as opposed to "store bought". Fact is I received the lower from family friend several years back and then after that I acquired the "completed upper receiver" from Daytona Tactical. The upper is a .308 WIN w/ a 20'' barrel and 1:10 twist. When I first tried firing the rifle there was all sorts of problems... light strikes...I bought /replaced hammer spring, feeding / ejection cluster f*&^%ks with any .308 ammo I tried. Then after replacing buffer and spring only issues were with ammo lighter than 168 grain. Once I tried the 150 grain then feeding/ejection cluster again after first shot. That is basically all I have at this point. Thanks again in advance. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted August 4 Report Share Posted August 4 If you do a search here for Daytona Tactical you will find problems with their products. Read the waterboarding thread and get us the measurements we need to help you. You didn't need to build it to measure things. What spring did you use with the buffer you bought from Clint? Off the top of my head. 1 soak your bolt carrier group in Mobile One motor oil. 2 Get a set of numbered drill bits and remove the gas block and tell us what size the gas port is. Quote Link to comment Share on other sites More sharing options...
Jephthah Posted August 4 Author Report Share Posted August 4 Aloha, I have a .308 Buffer Spring (11 1/16'') and a CAR-10XH Buffer weight (6.61 oz.) from Clint for my 7'' Buffer tube. Thanks I will look into measuring next... Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 5 Report Share Posted August 5 (edited) 7 hours ago, Jephthah said: Aloha, I have a .308 Buffer Spring (11 1/16'') and a CAR-10XH Buffer weight (6.61 oz.) from Clint for my 7'' Buffer tube. Thanks I will look into measuring next... That will be a legit Recoil System. The focus will need to be on the Gas System, the barrel specs= gas block journal diameter, gas port diameter in your barrel, plus the gas tube length. Edited August 5 by 98Z5V Quote Link to comment Share on other sites More sharing options...
Jephthah Posted Wednesday at 05:25 AM Author Report Share Posted Wednesday at 05:25 AM I do not have the wherewithal to successfully undertake the gas port system evaluation and R+R . Still am trying to wrap my head around the reason why the rifle works great with heavier rounds. Is it because the round stays longer in the barrel (do to weight) and then the accumulation of gas pressure is adequate for recycling...and the lighter rounds exit sooner (also due to diminished weight) as well as the gas that would otherwise be recycling the next round? Sorry I am a Carpenter not a machinist. How would I order a new completed upper if I can not insure the system is up to par? Recommendations? Quote Link to comment Share on other sites More sharing options...
sketch Posted Wednesday at 06:29 AM Report Share Posted Wednesday at 06:29 AM As a carpenter my self these guys have been my confidence in many things rifle related. I would tool up and disassemble my self to find the answers or take it to a gunsmith. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted Wednesday at 05:01 PM Report Share Posted Wednesday at 05:01 PM What probably happens is the heavier bullets are in the barrel just a fraction of a second longer. Allowing the amount of gas going back to the bolt carrier group to be enough. Letting the rifle cycle. Amazon has Numbered drill bit sets. Also get a caliper to measure the drill bits. Remove the gas block. Which drill bit just fits? Which drill bit is just a fraction to large? That tells you about the size of your gas port. Use the shank of the drill bit not the pointed end to measure. How many rounds do you have through this rifle? The bolt carrier group may not be broken in yet. Did you soak the BCG in Mobile One overnight? Quote Link to comment Share on other sites More sharing options...
Jeff300 Posted Wednesday at 06:34 PM Report Share Posted Wednesday at 06:34 PM this is what @shooterrex mentions to do with the drill bit, it is also in the link @98Z5V sent you waterboarding. That link has a ton of great info in it. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted Thursday at 03:25 AM Report Share Posted Thursday at 03:25 AM 22 hours ago, Jephthah said: I do not have the wherewithal to successfully undertake the gas port system evaluation and R+R . 9 hours ago, Jeff300 said: this is what @shooterrex mentions to do with the drill bit, it is also in the link @98Z5V sent you waterboarding. That link has a ton of great info in it. `Correct. This thread explains all about it, and it's why I recommended you read it in the first place. If you're a good carpenter - measuring isn't new to you. For this, you just need different tools. Harbor Freight digital calipers and drill bit are perfectly fine, to get to the conclusion. Here's why all this shiit really matters: You've just been given a plethora of information - I suggest you read it. It explains all of what's has been discussed. ALL of it. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted Thursday at 01:50 PM Report Share Posted Thursday at 01:50 PM On 8/5/2025 at 10:25 PM, Jephthah said: I do not have the wherewithal to successfully undertake the gas port system evaluation and R+R . Still am trying to wrap my head around the reason why the rifle works great with heavier rounds. Is it because the round stays longer in the barrel (do to weight) and then the accumulation of gas pressure is adequate for recycling...and the lighter rounds exit sooner (also due to diminished weight) as well as the gas that would otherwise be recycling the next round? Sorry I am a Carpenter not a machinist. How would I order a new completed upper if I can not insure the system is up to par? Recommendations? I do not have the wherewithal to successfully undertake the gas port system evaluation and R+R . ^^You need to do this^^ Still am trying to wrap my head around the reason why the rifle works great with heavier rounds. ^^To understand this^^ These things are pretty simple. Baby steps, follow through the waterboarding thread. Take pictures and post. Most everyone here started out same way. Quote Link to comment Share on other sites More sharing options...
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