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  #461  
Old 10-29-2021, 03:24 PM
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Mine donít look much different than yours on the lower access spacing/gap. So Iím thinking itís the spring. Are you sure you used the correct spring when you installed the lower parts?


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  #462  
Old 10-29-2021, 03:28 PM
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Yes, the StrelokPro app has a Kestrel connection/ compatibility.




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  #463  
Old 10-30-2021, 12:11 AM
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Mine donít look much different than yours on the lower access spacing/gap. So Iím thinking itís the spring. Are you sure you used the correct spring when you installed the lower parts?


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No, I'm not sure of that. I've ordered a couple of Bolt catch replacement kits that have the appropriate spring, detent, and roll pin. As soon as I get those in, I'll pull out the old assembly, hopefully without damaging the lower. Ill have to lube it up with penetrating oil to loosen the old pin. Then I an pull it out.
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  #464  
Old 10-30-2021, 05:00 PM
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No, I'm not sure of that. I've ordered a couple of Bolt catch replacement kits that have the appropriate spring, detent, and roll pin. As soon as I get those in, I'll pull out the old assembly, hopefully without damaging the lower. Ill have to lube it up with penetrating oil to loosen the old pin. Then I an pull it out.

Thatís a good start.


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Old 11-02-2021, 11:00 AM
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Thatís a good start.


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What's your recommendation on removing the old bolt catch roll pin? I'll probably start with some penetrating oil and light taps. I just have to be real careful I don't damage the lower.
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  #466  
Old 11-05-2021, 10:28 PM
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What's your recommendation on removing the old bolt catch roll pin? I'll probably start with some penetrating oil and light taps. I just have to be real careful I don't damage the lower.

Tape up the lower anywhere the punch or hammer may come in contact with. Use the proper sized punch and lightly tap it out from the muzzle towards the Butt end. Take your time and use oil. Should come out somewhat easily.


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  #467  
Old 11-08-2021, 06:43 PM
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Update: The replacement Bolt Catch groups arrived today and took less than 1hr to install (including removing the old parts).


These are some pics below of both the original group and the replacement group. The original is on the right. First the spring and detent.




You'll notice the spring on the right (original) is shorter and a little thicker, but it matches the fit of the detent/plunger on the right. The spring and detent/plunger on the left also match each other and the spring is softer. So, I conclude that the original spring and detent/plunger were the correct ones for the bolt catch group installed. But was the group itself correct?

Now, the view of the bolt catches, themselves. Original on the right.





You'll notice the big difference in design. I think this was the primary issue causing the catch not to lock. The spring didn't help either, but I think this was the real culprit.

I completely replaced the original parts with the replacements, all except the roll pin which fit back in properly.

The bolt catch works flawlessly, now. I tested it with some new snap caps that actually had the same weight as live rounds. They ejected properly and the last ejection resulted in the catch locking strongly. I dropped the empty mag and then gave the weapon a light bang, and it held. Only when I pressed the release did it close and go into battery. I will do a final test at JTAC this month at my next visit to confirm it will hold after firing/ejecting the last round in the mag.

Thanks to all for your help. The AR is fully functional now. Confidence totally built.



Sometime early next year, I will begin the 2nd build. Hopefully, to go a lot smoother.
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  #468  
Old 11-17-2021, 01:10 PM
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And yet another Update. Had an excellent day on the precision range. Got a really nice grouping on the RPR. I just have to adjust a smidge more and I'll be right on target. But I also have to learn to control my own movements as well because no matter how accurate you are with your rifle, you also must have accuracy in how you hold it. And I'm complicating things by learning how to shoot left handed (I'm right handed, left eye dominant).


The AR is working perfectly and the bolt catch held after I emptied a mag. It is 100% now. I just have to keep it cleaned and oiled. And I have to make some minor adjustments in re: zeroing it in. At least, I'm on paper and very close to zero. I think one more range session should do it.



Thanks all. I'll most likely start the 2nd AR build in early 2022.
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  #469  
Old 11-29-2021, 09:51 AM
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Quick Question: What are you all recommending for "Frangible 5.56?" If I'm going to put either this build or "Build #2 (comming in 2022) into the HD plan, I'm not going to be able to use "Green Tip" for that So, I'm looking for some good Frangible 5.56 that will get the job done without overdoing it.


Any recommendations?
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