The Firing Line Forums

Go Back   The Firing Line Forums > The Hide > The Art of the Rifle: Semi-automatics

Reply
 
Thread Tools Search this Thread
Old March 3, 2018, 08:47 PM   #1
kymasabe
Senior Member
 
Join Date: June 10, 2005
Location: SW Florida
Posts: 2,051
AR mag hard to lock in place ??

My third complete PSA lower and something doesn't feel right. First two were easy to insert and lock in the mag, effortless. This one, I have to smack the bottom of the mag to get it to lock in or else it falls out. Is this something I can fix myself or should I send the lower back to PSA for repair ?
__________________
God's creatures big and small, eat them one, eat them all.
kymasabe is offline  
Old March 3, 2018, 08:53 PM   #2
DubC-Hicks
Senior Member
 
Join Date: December 20, 2009
Location: Backwoods, Northern MI
Posts: 916
Are you loading a full mag with the bolt closed?

If you lock the bolt back, how does the mag lock in? Empty or loaded shouldn't matter here
__________________
”Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars.” ~Unknown
DubC-Hicks is offline  
Old March 3, 2018, 09:07 PM   #3
rickyrick
Senior Member
 
Join Date: March 15, 2010
Posts: 6,778
Push the mag release button as far as you can with a blunt punch, once the magazine catch is pushed clear of the mag well on the opposite side, you can unscrew it to adjust it. You can also screw it in more to increase the tension as well.

That’s if it needs adjustment, kinda hard to tell remotely
rickyrick is offline  
Old March 3, 2018, 09:10 PM   #4
HiBC
Senior Member
 
Join Date: November 13, 2006
Posts: 5,891
A classic error is to stuff one too many rounds in the mag. ie 21 rds in a 20 rounder. Not so good for the mag lips.If they get spread you have malfunctions.
Try loading one round less than full cap.
HiBC is offline  
Old March 3, 2018, 11:23 PM   #5
osbornk
Senior Member
 
Join Date: August 11, 2012
Location: Marion, Va
Posts: 1,265
I have done it twice where I put 31 in a 30 round mag and initially thought I had a problem. I felt like a fool when I discovered what I had done. #31 will go right in the mag without a problem.
osbornk is offline  
Old March 4, 2018, 07:59 AM   #6
Mobuck
Senior Member
 
Join Date: February 2, 2010
Posts: 6,155
"A classic error is to stuff one too many rounds in the mag. ie 21 rds in a 20 rounder. Not so good for the mag lips.If they get spread you have malfunctions.
Try loading one round less than full cap.
I have done it twice where I put 31 in a 30 round mag and initially thought I had a problem. I felt like a fool when I discovered what I had done. #31 will go right in the mag without a problem."
A fully loaded mag will always have the top round on the right. I always load with the top round on the right. That way when I chamber and do a mag check, the mag has a round on the left. NO "PRESS CHECKS" FOR ME, once the bolt runs home, it stays there.
Mobuck is offline  
Old March 4, 2018, 08:03 AM   #7
kymasabe
Senior Member
 
Join Date: June 10, 2005
Location: SW Florida
Posts: 2,051
Mags were empty, bolt closed, tried brand new Pmags and new Amend2 mags, same condition, will try to unscrew the mag catch by one turn or two and see if that helps.
I just doesn't feel the same as my other builds, the other mags would pop right in and lock in without much effort. .Right now, these I have to really smack to stay in place, and I'm not confident they're locked in securely.
__________________
God's creatures big and small, eat them one, eat them all.
kymasabe is offline  
Old March 4, 2018, 12:42 PM   #8
jonnyc
Senior Member
 
Join Date: July 20, 2009
Location: PA
Posts: 1,342
Try the mag catch from your "bad" rifle in one of your "good" rifles. More of a chance of the catch being a problem than the lower.....not to mention an easier fix.
__________________
2016 PA Cartridge Collector Show!!!
Buy...Sell...Trade All Types of Ammunition & Ordnance
Details: http://thefiringline.com/forums/show...75#post6228275
jonnyc is offline  
Old March 4, 2018, 10:02 PM   #9
kymasabe
Senior Member
 
Join Date: June 10, 2005
Location: SW Florida
Posts: 2,051
I don't have those guns anymore. So...will try to find a latch locally and try that.
__________________
God's creatures big and small, eat them one, eat them all.
kymasabe is offline  
Old March 4, 2018, 11:07 PM   #10
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Parker, CO
Posts: 4,554
Did adjusting the latch help?
marine6680 is offline  
Old March 4, 2018, 11:22 PM   #11
kymasabe
Senior Member
 
Join Date: June 10, 2005
Location: SW Florida
Posts: 2,051
Quote:
Originally Posted by marine6680 View Post
Did adjusting the latch help?
No, adjustment did not help. One turn out was no difference, two turns out brought the button too far out.
__________________
God's creatures big and small, eat them one, eat them all.
kymasabe is offline  
Old March 5, 2018, 12:23 AM   #12
44 AMP
Staff
 
Join Date: March 11, 2006
Location: Upper US
Posts: 18,438
There are two possible reasons why a mag won't lock in, besides spring tension.
1) the catch part of the mag release does not fit the hole in the mag.
2) the catch and the hole in the mag are not properly lined up.

Which of these and why is the question.

How do they lock in with the bolt open?

Remember this is a build. It's not impossible for parts to be "in spec" and still have "stacking tolerances" that cause problems.

Is it possible that the specific upper and lower you are using are giving you a tiny bit less clearance than needed for the mags to lock in smoothly, with the bolt closed?

If they only need a smack to lock in when the bolt is closed that would be my first guess. And, if that's the case, you might send the lower back and have it returned saying "there's nothing wrong with it". Might even get you stuck with the shipping bill.

good luck
__________________
All else being equal (and it almost never is) bigger bullets tend to work better.
44 AMP is offline  
Old March 5, 2018, 02:36 AM   #13
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Parker, CO
Posts: 4,554
You can try a different mag catch.

Have you tried to see if it locks in with no issues with the upper off the lower?

If the mag locks in fine with the upper off of the lower, its not guaranteed that it isn't the catch, but makes it much less likely.

If you use a new magazine, you may be able to see marks where the binding is happening.
marine6680 is offline  
Old March 5, 2018, 05:48 AM   #14
stagpanther
Senior Member
 
Join Date: March 2, 2014
Posts: 5,025
Here's what I would do:

Remove upper from lower, then remove both the bolt catch and magazine catch (cock trigger and be sure safety is on). Ascertain magazine can freely move into and out of mag well. If yes, reattach magazine catch (inspecting all parts to make sure they are in good condition/assembled properly) and see if magazine can freely be inserted and removed. If yes, reattach bolt catch making sure all it's parts are in good condition and functioning properly--ascertain the magazine can still be inserted and lock into the well. If yes, reattach upper and with bolt closed--see if you can insert and remove magazine. If yes, lock bolt back, ensuring the bolt catch is properly aligned so that it's stopping the BCG at the bolt face--as well as hooking the rear of the magazine.

If the procedure fails at any of the steps--you should be able to isolate the reason why. My guess is odds are you have a simple alignment problem with a couple of lower parts that should be very easy to fix. If you haven't done this kind of thing before Brownell's has good "how to" videos to guide you through. It's never a bad idea to have spare parts on hand. Bolt catches take a pounding by the carrier and I've spent hours chasing other solutions when the real answer lay with one of them.
__________________
I screw things up--so you don't have to.
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!
stagpanther is offline  
Old March 5, 2018, 05:06 PM   #15
kymasabe
Senior Member
 
Join Date: June 10, 2005
Location: SW Florida
Posts: 2,051
Well, just had a nice conversation with Palmetto State Armory, they're sending me two return labels so I can send back my upper and my lower, they'll reassemble the two halves there and see which one is out of spec. They're not happy with the fact that my rear pin is damn near impossible to get in or out so...thinking I may have defective/out of spec lower. Unfortunately, there's a 15 day minimum wait once the receivers get there, plus repair, plus shipping back, and if they replace my lower and has new serial number, will have to go thru my FFL again, which is another $23, which they claim they'll reimburse me for but...I guess I'll be AR-less for a month. Again.
__________________
God's creatures big and small, eat them one, eat them all.
kymasabe is offline  
Old March 5, 2018, 07:24 PM   #16
Mobuck
Senior Member
 
Join Date: February 2, 2010
Posts: 6,155
".thinking I may have defective/out of spec lower. "

You might but push pin movement is often difficult until things get happy with each other. I have several AR's that require some "persuasion" on the push pins.
Mobuck is offline  
Old March 5, 2018, 07:40 PM   #17
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Parker, CO
Posts: 4,554
A little tightness can mean less play between receivers.

As long as it isn't overly difficult, I do not mind it being a little tight... You should still be able to push it through with a good hard push of the thumb at least though.
marine6680 is offline  
Old March 7, 2018, 05:03 PM   #18
Big Shrek
Senior Member
 
Join Date: August 6, 2009
Location: NorthWest Florida
Posts: 1,299
That's the wonderful thing about repairs, at least PSA actually fixes the issue!

You oughta try scheduling a Chevy recall repair...Ye Gods!
First they set you an appointment 3-4 months away at the nearest dealership,
then, reschedule at least once...kicking it back a few more weeks,
then a repair that's supposed to take an HOUR, takes them three days...
they do something incorrect, like forgetting to hook the gas gauge back up
and you have to go back and wait ANOTHER day for them to fix their screwup.
You then find out later that it's a 30-minute job if they would just give you the dang part...

This is why it's a bad idea to buy Chevy Minivans...
__________________
Marlin Specialist
Calico Specialist
A gun should be a tool in the hands of a deadly weapon, not a deadly weapon in the hands of a tool.
Big Shrek is offline  
Old March 7, 2018, 06:51 PM   #19
rickyrick
Senior Member
 
Join Date: March 15, 2010
Posts: 6,778
I have one that the push pins don’t like me. But has gotten better with time.
rickyrick is offline  
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:40 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2018 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08281 seconds with 8 queries