panel77 Posted March 31, 2019 Report Share Posted March 31, 2019 Please measure with accurate tool from top of lower to upper side of mag catch slot. Quote Link to comment Share on other sites More sharing options...
HotRod308 Posted March 31, 2019 Report Share Posted March 31, 2019 Curious to what for? I assume some kind of problem? Quote Link to comment Share on other sites More sharing options...
mrmackc Posted March 31, 2019 Report Share Posted March 31, 2019 On what? a 1911 or CZ75 or an Ithaca 37? or a Matel M16? Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted March 31, 2019 Report Share Posted March 31, 2019 I'm guessing an AR10 since he has another thread with trouble on one. I don't think that's your problem but i'll see if I can get one here in a bit. Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted March 31, 2019 Report Share Posted March 31, 2019 Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted March 31, 2019 Report Share Posted March 31, 2019 65 is a tad more than 5/8 .65 is a tad less than 21/32 Quote Link to comment Share on other sites More sharing options...
Boot_Scraper Posted March 31, 2019 Report Share Posted March 31, 2019 I got about 4.8cm. I hope this helps. Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted March 31, 2019 Report Share Posted March 31, 2019 2 minutes ago, Boot_Scraper said: I got about 4.8cm. I hope this helps. Was he talking about measuring the pic he posted or on a real AR? well now i'm cornfused..but that don't take much.😂 Quote Link to comment Share on other sites More sharing options...
Boot_Scraper Posted March 31, 2019 Report Share Posted March 31, 2019 I'm sure he was talking about a real 308 AR (I'm assuming it's a 308). I can never pass up an opportunity to be a samrtazz though. Kidding aside, my Xantos measures 0.669" and my PA-10= 0.700". Quote Link to comment Share on other sites More sharing options...
ARTrooper Posted March 31, 2019 Report Share Posted March 31, 2019 3 hours ago, Boot_Scraper said: I got about 4.8cm. what's cm? sounds like one of those foreign measurements. but I live in Merica! Quote Link to comment Share on other sites More sharing options...
sketch Posted March 31, 2019 Report Share Posted March 31, 2019 (edited) 14 hours ago, panel77 said: Please measure with accurate tool from top of lower to upper side of mag catch slot. looks to be 1/2" on my phone if zoom in i get 2-3/4" what did i win?? Edited March 31, 2019 by sketch I used a steel tape measure. Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted March 31, 2019 Report Share Posted March 31, 2019 (edited) 11 minutes ago, sketch said: looks to be 1/2" on my phone if zoom in i get 2-3/4" what did i win?? A three day and night cruise to jamaica, all I need is your SS# and Credit card # to verify you are who you say you are. Edited March 31, 2019 by Belt Fed Quote Link to comment Share on other sites More sharing options...
ar-mountaineer Posted March 31, 2019 Report Share Posted March 31, 2019 .671” on my Fulton Quote Link to comment Share on other sites More sharing options...
unforgiven Posted April 1, 2019 Report Share Posted April 1, 2019 6 hours ago, sketch said: looks to be 1/2" on my phone if zoom in i get 2-3/4" what did i win?? Hahaha damn steel tape 😂 Quote Link to comment Share on other sites More sharing options...
panel77 Posted April 1, 2019 Author Report Share Posted April 1, 2019 21 hours ago, panel77 said: Please measure with accurate tool from top of lower to upper side of mag catch slot. Sorry I thought this was the AR 308 Forum. on a 308/large pattern AR lower. Long story short, I am trying to eliminate variables in a feeding issue Quote Link to comment Share on other sites More sharing options...
panel77 Posted April 1, 2019 Author Report Share Posted April 1, 2019 Sorry for not being more clear. YES, I am having PITA with a 308 AR. tried multiple complete uppers from 2 different vendors(PSA fail-fixed with help of 94x? member) but after swapping lowers with good uppers, mix/match, swap with about xx different combinations-the lowers appear to POSSIBLY be the problem and POSSIBLY not be allowing the mag to sit high enough into upper to get stripped(insert joke here) of the next round properly. from all the online spec drawings I can find and attempting to do math(ouch) it looks like the spec(yeah i know there isnt one) is supposed to be .685-MAYBE... but thats the conclusion from drawings. 2 lowers that mo matter what upper is on get the bolt riding over the round too intermittently to be useful for more than a hammer(if it doesnt go bang E-V-E-R-Y time, its a hammer)lead me to see how deep the mag sits hence the poll. mag catch location dictates mage insertion depth which dictates how effectively the bolt will strip a new round. 'I think" and since I can guarantee I know less about this sort of thing, I am working to get all your brainpower on it. Thank you to all who supplied info, I am hoping to accumulate a statistical sample size to determine the folly or validity of my theory. Quote Link to comment Share on other sites More sharing options...
panel77 Posted April 1, 2019 Author Report Share Posted April 1, 2019 Hellfire got back to me and stated they have a .685 distance Colfax doesnt make 80% anymore but they stated theirs are .663 +/- 0.005 I have a theory that appears to be playing out to be at least a component of a problem. Quote Link to comment Share on other sites More sharing options...
panel77 Posted April 1, 2019 Author Report Share Posted April 1, 2019 17 hours ago, ar-mountaineer said: .671” on my Fulton and I assume you have zero feeding issues. care to state buffer weight, buffer length, tube length, and spring length? gas system length? Quote Link to comment Share on other sites More sharing options...
panel77 Posted April 1, 2019 Author Report Share Posted April 1, 2019 23 hours ago, Boot_Scraper said: I'm sure he was talking about a real 308 AR (I'm assuming it's a 308). I can never pass up an opportunity to be a samrtazz though. Kidding aside, my Xantos measures 0.669" and my PA-10= 0.700". and I assume you have zero feeding issues on the Xantos. care to state buffer weight, buffer length, tube length, and spring length? gas system length? have you ever had mag feed issues on your PSA? is it PSA upper AND lower? Quote Link to comment Share on other sites More sharing options...
panel77 Posted April 1, 2019 Author Report Share Posted April 1, 2019 On 3/31/2019 at 8:10 AM, Belt Fed said: looks like .5000 but then you state.65. in all cases-better than what i measured. and I assume you have zero feeding issues. care to state buffer weight, buffer length, tube length, and spring length? gas system length? Quote Link to comment Share on other sites More sharing options...
ar-mountaineer Posted April 1, 2019 Report Share Posted April 1, 2019 54 minutes ago, panel77 said: and I assume you have zero feeding issues. care to state buffer weight, buffer length, tube length, and spring length? gas system length? I have no upper yet, haha. But I have a rifle length buffer tube/buffer, 5.4oz buffer. It’s the armalite kit. I’m still waiting on Fulton to send me the upper. Been 9 weeks. As as far as the other clipper pictured if you look at the scale on it the dial is how far past the number Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted April 1, 2019 Report Share Posted April 1, 2019 1 hour ago, panel77 said: looks like .5000 but then you state.65. in all cases-better than what i measured. and I assume you have zero feeding issues. care to state buffer weight, buffer length, tube length, and spring length? gas system length? I don't know those dimensions and weights, It's a factory rifle from Diamondback arms. I have a few by them with zero issues. Quote Link to comment Share on other sites More sharing options...
mrmackc Posted April 1, 2019 Report Share Posted April 1, 2019 13 hours ago, panel77 said: Sorry for not being more clear. YES, I am having PITA with a 308 AR. tried multiple complete uppers from 2 different vendors(PSA fail-fixed with help of 94x? member) but after swapping lowers with good uppers, mix/match, swap with about xx different combinations-the lowers appear to POSSIBLY be the problem and POSSIBLY not be allowing the mag to sit high enough into upper to get stripped(insert joke here) of the next round properly. from all the online spec drawings I can find and attempting to do math(ouch) it looks like the spec(yeah i know there isnt one) is supposed to be .685-MAYBE... but thats the conclusion from drawings. 2 lowers that mo matter what upper is on get the bolt riding over the round too intermittently to be useful for more than a hammer(if it doesnt go bang E-V-E-R-Y time, its a hammer)lead me to see how deep the mag sits hence the poll. mag catch location dictates mage insertion depth which dictates how effectively the bolt will strip a new round. 'I think" and since I can guarantee I know less about this sort of thing, I am working to get all your brainpower on it. Thank you to all who supplied info, I am hoping to accumulate a statistical sample size to determine the folly or validity of my theory. What about the magazine or magazines, what ones are you using? Could it be that the mag lips are bent down too much? I have had that happen. I bend them up until they only hold the full round loads. Usually fixed the problem with cheapo mags including DPMS original mag. There are mags, and then there are good mags.. Quote Link to comment Share on other sites More sharing options...
Boot_Scraper Posted April 1, 2019 Report Share Posted April 1, 2019 7 hours ago, panel77 said: and I assume you have zero feeding issues on the Xantos. care to state buffer weight, buffer length, tube length, and spring length? gas system length? have you ever had mag feed issues on your PSA? is it PSA upper AND lower? Xanthos runs like clockwork. Never missed a beat with my handloads. The Pa-10 had a hickup at first but was probably self inflicted. Both using Magpul mags. I have an Armaspec SRS 308 buffer in my Xanthos now, but it was in my PA-10. PA-10 now sports a DPMS A2 rifle buffer setup. I hope you get everything squared up. I know how it is. Quote Link to comment Share on other sites More sharing options...
Lane Posted April 2, 2019 Report Share Posted April 2, 2019 What kind of magazines are you using (others have asked too)? Never had a single issue with polymers, but have modified every one of my stainless steel magazines in some way or another. The measurement on my Ceratac .308 is 0.650"; perhaps +/- 0.0005", but I measured it quite a few times and got the same numbers. Belt Fed showed the same thing 0.6500"; you just have to read the first digit off the slide; and the rest on the large dial. Quote Link to comment Share on other sites More sharing options...
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