The FAL Files  

Go Back   The FAL Files > Weapons Discussion > Gunsmithing & Build It Yourself

Notices

Reply
 
Thread Tools Display Modes
Old February 18, 2018, 22:29   #1
shortgas
Registered
 
FALaholic #: 65492
Join Date: Feb 2012
Location: Out West
Posts: 38
Abnl bolt and breech wear - cause?

Having an odd problem with my favorite para: DSA reciever with DSA bolt carrier and Imbel bolt (low miles). Properly barreled, headspaced by a knowledgable smith. Also inspected and test fired by DSA during the lower recall a few years ago and declared a 2 MOA rifle.
Abnormal wear is occurring on the upper receiver where the bolt face is contacting the upper receiver on bolt closure very firmly on what I will (perhaps erroneously) call the breech face. The bolt also appears to be riding too high as it approaches the breech and is slamming into the upper receiver just above the breech causing another wear point and galling. Finally the left side of the front face of the bolt carrier is just starting to contact the upper receiver.
My suspicion is that headspace and/or locking piece is no longer in spec. If this is the case I am at a loss to understand why this changed.

I had been running a DSA scope mount which hid this relatively new damage. Once I removed the scope mount to do maintenance I noted a broken firing pin and on additional inspection noted the above.
I dont see any other similar cases in the archives so my research didnt yield much. Any RKIs out there know whats going on? I wont be firing this rifle until this is fixed. I will talk to DSA this week. Thx in advance.
shortgas is offline   Reply With Quote
Old February 19, 2018, 00:43   #2
308/223shooter
FALAholic enabler
Gold Contributor
 
308/223shooter's Avatar
 
FALaholic #: 15405
Join Date: Sep 2004
Location: pacific northwest
Posts: 6,076
What is the serial letter and number prefix of your receiver?
__________________
What if the Mystery Babalon described in Revelation, which is destroyed by the nations of the North, is actually America?

Before you die, you should have a will with extra copies. The old saying "No one will screw you faster than family" is bloody well true.
308/223shooter is online now   Reply With Quote
Old February 19, 2018, 07:36   #3
nwobhm
ΜΟΛΩΝ ΛΑΒΕ
 
nwobhm's Avatar
 
FALaholic #: 9580
Join Date: Feb 2003
Location: USA
Posts: 8,965
Pictures?
nwobhm is offline   Reply With Quote
Old February 19, 2018, 23:21   #4
shortgas
Registered
 
FALaholic #: 65492
Join Date: Feb 2012
Location: Out West
Posts: 38
DS35XXX

Could not get any good pics and have never figured out how to post pics..

At this point this rifle looks like it is self destructing. Sad.

Such a huge difference in durability between my 20 yr old factory DSA STG58 and this newer SA58. No comparison in fit, finish, function.

Awaiting DSA's response.
shortgas is offline   Reply With Quote
Old February 19, 2018, 23:31   #5
SmokeEater2
Old grouchy bastid
Bronze Contributor
 
SmokeEater2's Avatar
 
FALaholic #: 10990
Join Date: Jun 2003
Location: NC Arkansas
Posts: 3,778
Well damn, I thought the DS prefix receivers were the older forged style.
SmokeEater2 is online now   Reply With Quote
Old February 20, 2018, 07:15   #6
FUUN063
Registered
 
FALaholic #: 35576
Join Date: Apr 2008
Location: Converse, Indiana
Posts: 6,491
It sounds like you think that the bolt is moving more forward than it's intended lockup position, maybe? I would do some quick visual checks, if it was mine. First, I have seen where the bolt contacts that top of the receiver when it lands just into battery. Sometimes, this just needs a little relieving in the "hood" area of the upper receiver. But, sometimes not. I have seen where the cut was not finished on the rails (bolt rides on) just before the end of it's travel. This, then, caused the bolt to "ride up" under pressure from the spring, cant or tilt, then hit the hood. Check the very corners of the upper inside where the rails are cut (top of them) just before where the barrel would contact the receiver (up and to each side of the feed ramps). Just a start. Pics may really help here. You can start by getting a free account on the photo hosting site called Imgur. Upload your pics to their site, then copy/paste them into your thread from there. I generally use their bottom selection (for forums) and then click "Medium Thumbnail". Good luck.


Leland
FUUN063 is offline   Reply With Quote
Old February 20, 2018, 10:55   #7
shortgas
Registered
 
FALaholic #: 65492
Join Date: Feb 2012
Location: Out West
Posts: 38
Excellent info FUU - thx. I will study the areas you suggested. Have the abnormalities you noted been just on DSA products or on other makes also?

I have been looking into archives and am amazed at the problems that have surfaced with some DSA receivers. Was not fully aware of these issues. GP has worked hard to shed light on the issue.

As far as age of the receiver I dont rightly remember. I put the .308s away once ammo hit $1/rnd and for a quite awhile lost touch with all things .308.
shortgas is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 On

Forum Jump


All times are GMT -5. The time now is 21:31.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
©1998-2018 The FAL Files