Colt AR-15 A2 sporter 2
You are Unregistered, please register to use all of the features of!    
Firearm & Gun Forum - > Long Guns > Auto & Semi-Auto Discussion > AR-15 Discussion >

Colt AR-15 A2 sporter 2

LinkBack Thread Tools Display Modes
Old 08-21-2010, 01:14 AM   #1
Feedback Score: 0 reviews
Join Date: Aug 2010
Location: westfield,new york
Posts: 1
Default Colt AR-15 A2 sporter 2

This is my first time on this site. Thanks for your help. I have the same AR that I bought slightly used in 1985. I remember I paid $400 that included 250rounds, 2-20 round mags and 3-30 rounders. For the first couple of years I shot it a lot but overall it really hasn't had a great deal of rounds through it. It has always been kept clean. My friend bought a new AR, so we went to the range. My rifle started shooting bursts of 3 to four rounds. Although it was cool I can not tolerate this illegal behavior from my rifle. The rifle is stone stock. I plan to replace the fire control group and all of the springs. I have learned that there may be different pin sizes for older ARs. Any ideas what could be causing this malfunction and recommendations for a fix. Thanks
rwright1 is offline  
Reply With Quote

Join Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join Today! - Click Here

Old 08-21-2010, 01:45 AM   #2
Feedback Score: 0 reviews
Quentin's Avatar
Join Date: Apr 2010
Location: Idaho
Posts: 6,968
Liked 1281 Times on 883 Posts
Likes Given: 1344


It sounds like you've already got a good idea what's wrong. Like you said it's annoying that Colt uses different pin sizes .170" instead of .154" but at least they are common parts that you can buy.

Definitely sounds like the the hammer/trigger sear or disconnector are at fault. You can dry fire to test the disconnector. Probably best to remove the upper and then cock the hammer, pull the trigger while you catch the hammer with your thumb so it doesn't damage the bolt stop and receiver. Keep the trigger pulled back and recock with your thumb (keeping it there to catch the hammer if it falls). The disconnector should now be holding back the hammer. Now you finally release the trigger and see if the disconnector releases the hammer and the trigger sear catches it.

Probably the timing between the disconnector and trigger is off or the parts are worn.
Quentin is offline  
Reply With Quote
Old 08-21-2010, 05:11 AM   #3
Feedback Score: 0 reviews
pagj17's Avatar
Join Date: Jul 2009
Location: Prescott Valley,Arizona
Posts: 2,433
Liked 210 Times on 150 Posts
Likes Given: 10


Something else to check, is make sure that A) the pin didn't move out of place,
B)look at the inside of the lower at the trigger, hammer, etc Look for Shiny, un-even pieces.
I had it happen on my ar after 200 rounds, and the pin wasn't centered, so it walked out and suddenly it was going 2 rounds at a time
------------Space Not for Hire.-----------
pagj17 is offline  
Reply With Quote

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
7.62x39 sks sporter value Please sharpshooter AK & SKS Discussion 10 02-27-2012 10:28 PM
SKS Sporter worth? delaswim AK & SKS Discussion 11 08-22-2010 03:44 AM
10/22 Sporter Project CA357 DIY Projects 20 12-10-2009 08:01 PM
Colt AR-15 Sporter Match HBar greenmachinegc General Rifle Discussion 0 08-03-2009 01:16 AM

Newest Threads