Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > AR15/10 Rifles


Reply

Issue with short stroking

 
LinkBack Thread Tools Display Modes
  #8  
Old 12-23-2013, 03:26 PM
Silver Member
 
Join Date: Jul 2007
Location: SW Wisconsin
Posts: 216
Re: Issue with short stroking

DO NOT swap the buffer itself, you'll beat the carrier key into the lower receiver at the end of the travel. As I stated before, you can just try the carbine buffer spring with the rifle length buffer and it may cycle better.
Reply With Quote
  #9  
Old 12-23-2013, 04:11 PM
Bronze Member
 
Join Date: Aug 2013
Location: Stockton, Utah
Posts: 68
Re: Issue with short stroking

I just put the carbine lower back on it to test some rounds and didn't have a single short stroke, although my groups got bigger. I assume there are two reasons for this, the first would be the stock AR trigger versus the Timney trigger that's in my other lower. The other is I think due to using a shooting pillow under the collapsable stock versus the Atlas monopod on the PRS stock.

I've done this trigger mod before:

15 Minute Practical Trigger Job for the AR-15

While it made a noticeable difference in the trigger pull, I was also getting a lot of failures to fire due to, what I think, is the firing pin not striking the primer hard enough. I've since went back to the stock trigger and I'm reluctant to try the mod again.
Reply With Quote
  #10  
Old 12-23-2013, 08:02 PM
Platinum Member
 
Join Date: Jan 2008
Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
Posts: 4,388
Re: Issue with short stroking

Quote:
Originally Posted by trophyhusband View Post
I just put the carbine lower back on it to test some rounds and didn't have a single short stroke, although my groups got bigger. I assume there are two reasons for this, the first would be the stock AR trigger versus the Timney trigger that's in my other lower. The other is I think due to using a shooting pillow under the collapsable stock versus the Atlas monopod on the PRS stock.

I've done this trigger mod before:

15 Minute Practical Trigger Job for the AR-15

While it made a noticeable difference in the trigger pull, I was also getting a lot of failures to fire due to, what I think, is the firing pin not striking the primer hard enough. I've since went back to the stock trigger and I'm reluctant to try the mod again.
Well no, the issue is ips speed, your bolt is not closing consistently with the other buffer and spring, which has other implications as well, the rounds are not stripped off your mag with the same force every time.
__________________
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf"
If you want to shoot Bergers start here!
http://www.longrangehunting.com/arti...accuracy-1.php
Reply With Quote
  #11  
Old 12-23-2013, 08:19 PM
Bronze Member
 
Join Date: Aug 2013
Location: Stockton, Utah
Posts: 68
Re: Issue with short stroking

Quote:
Originally Posted by ICANHITHIMMAN View Post
Well no, the issue is ips speed, your bolt is not closing consistently with the other buffer and spring, which has other implications as well, the rounds are not stripped off your mag with the same force every time.
I'm not following. How does the bolt closing effect accuracy?
Reply With Quote
  #12  
Old 12-23-2013, 08:45 PM
Platinum Member
 
Join Date: Jan 2008
Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
Posts: 4,388
Re: Issue with short stroking

Quote:
Originally Posted by trophyhusband View Post
I'm not following. How does the bolt closing effect accuracy?
it affects accuracy with its headspace and machine tolerances. They are held to a certain spec "chamber spc", with it being a DD upper and bcg, I'm sure they both are. However if your not operating the system within its intended design parameters, then your bolt is not "locking up" or fully seating in to battery, which varies your head space, from shot to shot based on how closely the manufacture of your ammunition held to sami spec, how you hold the weapon, how you pull the trigger, barrel length, gas system length, gas port diameter, buffer weight, spring length all effect ips speed and have bearing on the system as a whole.

Bolts bounce, if your spring and buffer don't have enough ass to stop it, your missing out!
__________________
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf"
If you want to shoot Bergers start here!
http://www.longrangehunting.com/arti...accuracy-1.php
Reply With Quote
  #13  
Old 12-23-2013, 11:11 PM
Bronze Member
 
Join Date: Aug 2013
Location: Stockton, Utah
Posts: 68
Re: Issue with short stroking

What is a "DD upper"?

Would pushing the forward assist button between shots ensure the bolt is locking up the same every time?

The gun is an off the shelf carbine with a 16 inch barrel chambered in .223/5.56.

The brass is LC once fired in this rifle, all trimmed to the same length.

Every powder charge is weighed on a balance scale.

The first pic is what I shot using the lower receiver with the rifle buffer and Timney trigger. There are only seven hole because 3 of the ten rounds I loaded got jammed and dented. Some of those seven rounds were chambered by pulling the charging handle and letting it go. Some rounds chambered as a result of the gun cycling properly, and there were a couple at the end of the string that cycled properly but I pulled the charge handle back just a little just to make sure a round chambered and then used the forward assist button.

The second pic is what I shot today using the lower with a carbine buffer and stock trigger. Everything cycled normally. Every shot felt good and even though the trigger pull was much harder, it didn't seem like that was throwing me off.

As you can see, there's a huge difference between the two.
Attached Thumbnails - Click to View Larger
Issue with short stroking-photo-2013-12-18-16.59-2.jpg   Issue with short stroking-photo-2013-12-23-20.42.jpg  

Reply With Quote
  #14  
Old 12-24-2013, 06:16 AM
Platinum Member
 
Join Date: Jan 2008
Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
Posts: 4,388
Re: Issue with short stroking

Disregard the DD I confused another thread on that detail, however that now leads me into a few more questions. Who made this rifle, who made the bcg, is you buffer stamped? I don't know what the propped spring length is for a 6.5 Grenada but bill Alexander sure will.
__________________
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf"
If you want to shoot Bergers start here!
http://www.longrangehunting.com/arti...accuracy-1.php
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Spot & Stalk or Ambush For Western Deer?
MOSTLY - Spot & Stalk - 74.16%
930 Votes
MOSTLY - Ambush - 25.84%
324 Votes
Total Votes: 1,254
You may not vote on this poll.

All times are GMT -5. The time now is 06:31 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC