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Posted: 10/31/2014 4:40:24 PM EDT
ETA: PSA replaced the pin
Lower is a PSA blem. using a PSA LPK w/MOE The diameter of the takedown pin in the LPK is 0.252" The diameter of the holes in the lower (as best as I can measure them with calipers) is 0.251" FYI the diameter of the pivot pin (already installed) is 0.2480" Luckily PSA is not a horrendous drive and I go there several times a month. ____________________________________________________________________________ So what's up with this? Does PSA use proprietary-sized takedown and pivot pins on their lowers? I would find it hard to believe the takedown pin holes on the lower were machined to the wrong diameter. |
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Posted: 10/31/2014 4:56:49 PM EDT
[#1]
If you are confident these are correct dimensions, take some 400 grit sand paper to the pin and test fit often.
Proprietary sizes? Not that I am aware of, it might just be tolerance stacking or an extra thick finish coat on one or both parts. |
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Posted: 10/31/2014 4:57:34 PM EDT
[#2]
its just a lil tight. NO big deal. You have 3 choices. 1. open up the holes with a file. 2. sand some of the coating off the pin. 3. oil the pin and tap it into the hole and over time it will loosen itself up. (this is what I would do) |
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Posted: 10/31/2014 5:01:54 PM EDT
[#3]
The pin will not fit at all.
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Posted: 10/31/2014 5:10:10 PM EDT
[#4]
Take down pin looks to be big.
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Posted: 10/31/2014 5:11:53 PM EDT
[#5]
Work on the cheapest part -IOW sand down the pin
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Posted: 10/31/2014 5:16:46 PM EDT
[#6]
Quote HistoryQuoted: The pin will not fit at all.  edit: ithought this was GD
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Posted: 10/31/2014 5:19:29 PM EDT
[#7]
Contact PSA and see if they'll send you a proper size replacement takedown pin.
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Posted: 10/31/2014 5:22:14 PM EDT
[#8]
Quote HistoryQuoted:
Work on the cheapest part -IOW sand down the pin Definitely! No way am I going to grind on the lower as a first or second remedy.
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Posted: 10/31/2014 5:25:42 PM EDT
[#9]
Quote HistoryQuoted:
Definitely! No way am I going to grind on the lower as a first or second remedy.
Quote HistoryQuoted:
Quoted:
Work on the cheapest part -IOW sand down the pin Definitely! No way am I going to grind on the lower as a first or second remedy.
I had one that was similar....lubed it up after a little sanding and it went right in. 
No worries, it will get looser over time. FWIW, I have switched to the BCM takedown pins, they are well worth the money. |
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Posted: 10/31/2014 6:32:22 PM EDT
[#10]
Dude, get a different pin. .002 to .003 might not sound like much but it kind of is. Do not file anything or rig the pin. The pin should be .250
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Posted: 10/31/2014 7:06:56 PM EDT
[#11]
Quote HistoryQuoted:
Dude, get a different pin. .002 to .003 might not sound like much but it kind of is. Do not file anything or rig the pin. The pin should be .250 Buddy of mine offered this sage advice: "The next time you go to PSA exchange the pin for one that fits. Sanding the pin to fit is the slow path to madness." |
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Posted: 10/31/2014 9:51:42 PM EDT
[#12]
Quote HistoryQuoted:
Buddy of mine offered this sage advice: "The next time you go to PSA exchange the pin for one that fits. Sanding the pin to fit is the slow path to madness." Quote HistoryQuoted:
Quoted:
Dude, get a different pin. .002 to .003 might not sound like much but it kind of is. Do not file anything or rig the pin. The pin should be .250 Buddy of mine offered this sage advice: "The next time you go to PSA exchange the pin for one that fits. Sanding the pin to fit is the slow path to madness." It wouldn't be that slow if you chucked it up in a high speed drill and held some sandpaper to the outside of it. |
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Posted: 10/31/2014 10:04:41 PM EDT
[#13]
You paid for a pin that works, not a project. DO exchange that pin with PSA. It'll also help PSA reduce the frequency of out of spec parts when customers tell 'em about such things. They can' fix what they never hear about.
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Posted: 10/31/2014 10:41:40 PM EDT
[#14]
Quote HistoryQuoted:
You're not using the right hammer
edit: ithought this was GD Quote HistoryQuoted:
Quoted:
The pin will not fit at all.
edit: ithought this was GD This is funny. |
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Posted: 10/31/2014 10:43:23 PM EDT
[#15]
OP,
Give them a call and they will prolly just send you a new pin. Put the old one in a drill chuck and sand it down just to have fun doing it. Best to you |
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Posted: 11/1/2014 2:34:07 AM EDT
[#16]
Pins should be .248, holes in lower should be .251, and .250 gage pin should go through both pivot and takedown holes all the way thru.
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Posted: 11/1/2014 4:07:02 AM EDT
[#17]
Quote HistoryQuoted:
You paid for a pin that works, not a project. DO exchange that pin with PSA. It'll also help PSA reduce the frequency of out of spec parts when customers tell 'em about such things. They can' fix what they never hear about. This is the correct route. You must call them. They never answered one of my emails. Prepare to be on hold for at least 20 minutes. |
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Posted: 11/1/2014 10:41:49 AM EDT
[#18]
I had an upper that the pin would not go into. I tried the same pin in another upper and it was tight but went in with a little lube.
I took a piece of cloth 240 grit, rolled it up so it would fit the hole in the upper and with just a little work got the pin to fit nicely. In my opinion work on what you have to make it fit like you want, very snug, IMO. Better than being to loose. ETA; In my case it was the hole in the upper that was tight. You may have an out of spec pin?? |
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Posted: 11/1/2014 12:47:33 PM EDT
[#19]
Quote HistoryQuoted:
This is the correct route. You must call them. They never answered one of my emails. Prepare to be on hold for at least 20 minutes. Quote HistoryQuoted:
Quoted:
You paid for a pin that works, not a project. DO exchange that pin with PSA. It'll also help PSA reduce the frequency of out of spec parts when customers tell 'em about such things. They can' fix what they never hear about. This is the correct route. You must call them. They never answered one of my emails. Prepare to be on hold for at least 20 minutes. I even had a set of YHM pins that had one out of spec. So it can happen to anyone. For non-locals, however, to wait 20min. on hold & THEN another 10min. getting taken care of THEN another few days to receive a new one, chucking it up & taking it down to .248" takes less than 5min. Life Is too short for all that other headache. |
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Posted: 11/1/2014 5:27:59 PM EDT
[#20]
Drove over to PSA Farrow Rd (that's their warehouse) and they cheerfully replaced the pin with one that fits. Problem solved.
While I was there they also did an inspection of my newly-built lower and they told me I'd installed the hammer spring incorrectly which would explain why the trigger pin would not stay in place.
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Posted: 11/1/2014 8:06:44 PM EDT
[#21]
Quote HistoryQuoted:
Drove over to PSA Farrow Rd (that's their warehouse) and they cheerfully replaced the pin with one that fits. Problem solved. While I was there they also did an inspection of my newly-built lower and they told me I'd installed the hammer spring incorrectly which would explain why the trigger pin would not stay in place. You have discovered the reason for all the "why are my pins walking out" threads for the last 15 years and why KNS pins sell(except for the M16 guys). |
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Posted: 11/1/2014 10:10:08 PM EDT
[#22]
Quote HistoryQuoted:
I even had a set of YHM pins that had one out of spec. So it can happen to anyone. For non-locals, however, to wait 20min. on hold & THEN another 10min. getting taken care of THEN another few days to receive a new one, chucking it up & taking it down to .248" takes less than 5min. Life Is too short for all that other headache. Quote HistoryQuoted:
Quoted:
Quoted:
You paid for a pin that works, not a project. DO exchange that pin with PSA. It'll also help PSA reduce the frequency of out of spec parts when customers tell 'em about such things. They can' fix what they never hear about. This is the correct route. You must call them. They never answered one of my emails. Prepare to be on hold for at least 20 minutes. I even had a set of YHM pins that had one out of spec. So it can happen to anyone. For non-locals, however, to wait 20min. on hold & THEN another 10min. getting taken care of THEN another few days to receive a new one, chucking it up & taking it down to .248" takes less than 5min. Life Is too short for all that other headache. Sounds like one of those prized oversized .251" - .252" Armalite NM Takedown Pins fell into your hands. Prized because they cannot keep them in stock. If I were you I'd drive back over there and get that jewel back and put it on eBay for $20.00 while the pins are out of stock at Armalite. Furthermore clearance should be .001" between the pin and bores which makes the bores in well made lowers .249 inch. Proper fit requires precision tooling and it requires precision tools to adjust pin fit properly. Files and sandpaper can make matters worse. Keep using your caliper, asking questions and having people check your work and your build should be fine. |
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