measurement poll

[panel77]

Please measure with accurate tool from top of lower to upper side of mag catch slot.

[HotRod308]

Curious to what for? I assume some kind of problem?

[mrmackc]

On what? a 1911 or CZ75 or an Ithaca 37? or a Matel M16?

[Belt Fed]

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.

[Belt Fed]

[Belt Fed]

65 is a tad more than 5/8
.65 is a tad less than 21/32

[Boot_Scraper]

I got about 4.8cm. I hope this helps. 

[Belt Fed]

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.😂

[Boot_Scraper]

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".

[ARTrooper]

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! 

[sketch]

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.

[Belt Fed]

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

[ar-mountaineer]

.671” on my Fulton

[unforgiven]

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 😂

[panel77]

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

[panel77]

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.

[panel77]

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.

[panel77]

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?

[panel77]

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?

[panel77]

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?

[ar-mountaineer]

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

[Belt Fed]

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.

[mrmackc]

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..

[Boot_Scraper]

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. 

[Lane]

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.