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Thread: Knight's Armament SR-15 E3 Legacy 16" & SR-15 E3 CQB SBR 11.5" malfunction suppressed

  1. #21
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    motoduck I sincerely thank you for your post.
    I should have the H3 in hand today or tomorrow and now I'm looking forward to going to the range to confirm proper ejection / function.
    I expected more from KAC than catering to the lowest common denominator among consumers of their rifles / uppers...
    (Opening up the gas port to accommodate the dumb-asses who bought their kit to only then turn around and feed it Tula / Wolf .223 junk ammo)
    Last edited by E-man930; 07-18-12 at 10:55.

  2. #22
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    I would not worry too much about ejection patterns. Along as ejection is forceful enough, consistent and the recoil feels 'normal' then I could care less where the brass lands.

  3. #23
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    I expected more from KAC than catering to the lowest common denominator among consumers of their rifles / uppers...
    (Opening up the gas port to accommodate the dumb-asses who bought their kit to only then turn around and feed it Tula / Wolf .223 junk ammo)Interesting assumption. I made a call to KAC trying to determine what they were using as a buffer spring. I did not have much luck getting an answer. I thought it strange that neither a factory SR15 or Factory SBR would work with a KAC can out of the box? Maybe their full auto lowers use a different spring (could not get an answer to that question either). I am not trying to bash KAC, I love thir product and have more items on order. Maybe KAC wanted a certain recoil impulse? I know the change in spring and buffer made recoil "harsher" instead of the stock "soft push" impulse? Just goes to show you never know what will work without testing it first.

  4. #24
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    I agree with you motoduck, I'm not trying to bash KAC either but they did enlarge their gas ports on the current SR-15 offerings compared to the SR-15 carbines they initially released. I'm not sure how that translates to the SBR uppers but I was disappointed to say the least. I guess they got tired of fielding calls from folks saying their new rifle won't cycle .223 reliably...

    My SBR's recoil impulse with the H2 KAC buffer and Colt carbine spring was really violent and created brass ejection issues where the brass would not get clear of the ejection port and tumble back in locking the gun up. I have since tried a Tubbs CS FW spring and the H2 combo (same result), and an H&K 416 "red stripe" spring and the H2 combo which resulted in no malfunctions but the brass ejection pattern was slightly erratic around 1:30-2:00. Yesterday, I tested a BCM H3 buffer along with the H&K spring and I think I found a sweet spot with my setup. The H3 buffer helped the rifle eject the brass another few feet further than the H2 and all of it was dead on at 2:00. You could probably have caught most of it with a cup so I am happy my ejection issues are solved. The combo also shoots incredibly soft and smooth, and combined with my LMT enhanced carrier, functions 100% with and without the can. I loaded about 10 rounds (I know it's a small sample for now) of XM193 one at a time in a Pmag and tested for the bolt to lock back, which it did every time both with and without the can. I also tested some random .223 ammo and it locked the bolt back with the can but not without; although it would cycle and feed without it. I put about 180-190 rounds through the current setup suppressed and had zero issues. I have decided to just keep it setup this way and put another 800-850 rounds (want to hit 1000 round mark suppressed) through it without cleaning it to see how reliable it will be going forward.

    My buddy has since ordered an H3 and BCM carbine spring for his SR15 and he intends to test his setup with a Tubbs CS spring, H&K 416 red stripe spring, and an H&K 416 tungsten buffer in addition to the H3 and BCM spring to see what works best. He is not running an enhanced LMT carrier so it will be interesting to see what works 100% in his gun. Thanks again everyone for the advice, I may break down and pickup an A5 setup / LMT SOPMOD stock one day just to see how tangible the difference is over my current franken-setup.
    Last edited by E-man930; 08-09-12 at 20:29.

  5. #25
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    Quote Originally Posted by vicious_cb View Post
    I would not worry too much about ejection patterns. Along as ejection is forceful enough, consistent and the recoil feels 'normal' then I could care less where the brass lands.
    Thanks for the insight - I finally have consistent ejection that I'm happy with...

  6. #26
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    Quote Originally Posted by E-man930 View Post
    I agree with you motoduck, I'm not trying to bash KAC either but it they did enlarge their gas ports on the current SR-15 offerings compared to the original SR-15 carbines they originally released. I'm not sure how that translates to the SBR uppers but I was disappointed to say the least. I guess they got tired of fielding calls from folks saying their new rifle won't cycle .223 reliably...

    My SBR's recoil impulse with the H2 KAC buffer and Colt carbine spring was really violent and created brass ejection issues where the brass would not get clear of the ejection port and tumble back in locking the gun up. I have since tried a Tubbs CS FW spring and the H2 combo (same result), and an H&K 416 "red stripe" spring and the H2 combo which resulted in no malfunctions but the brass ejection pattern was slightly erratic around 1:30-2:00. Yesterday, I tested a BCM H3 buffer along with the H&K spring and I think I found a sweet spot with my setup. The H3 buffer helped the rifle eject the brass another few feet further than the H2 and all of it was dead on at 2:00. You could probably have caught most of it with a cup so I am happy my ejection issues are solved. The combo also shoots incredibly soft and smooth, and combined with my LMT enhanced carrier, functions 100% with and without the can. I loaded about 10 rounds (I know it's a small sample for now) of XM193 one at a time in a Pmag and tested for the bolt to lock back, which it did every time both with and without the can. I also tested some random .223 ammo and it locked the bolt back with the can but not without; although it would cycle and feed without it. I put about 180-190 rounds through the current setup suppressed and had zero issues. I have decided to just keep it setup this way and put another 800-850 rounds (want to hit 1000 round mark suppressed) through it without cleaning it to see how reliable it will be going forward.

    My buddy has since ordered an H3 and BCM carbine spring for his SR15 and he intends to test his setup with a Tubbs CS spring, H&K 416 red stripe spring, and an H&K 416 tungsten buffer in addition to the H3 and BCM spring to see what works best. He is not running an enhanced LMT carrier so it will be interesting to see what works 100% in his gun. Thanks again everyone for the advice, I may break down and pickup an A5 setup / LMT SOPMOD stock one day just to see how tangible the difference is over my current franken-setup.
    I'm glad you got it functioning.

    I think a Vltor A5 w/ A5H4 heavy buffer, possibly paired with a springco Green spring, would work wonders for you.

    I think 'Gunz runs this setup with an LMT enhanced carrier in his SBR.....IIRC it worked suppressed and unsuppressed.

  7. #27
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    Thanks for the advice, I definitely will take note - just hate letting go of my UBR, which balances out my SBR quite nicely.

  8. #28
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    Quote Originally Posted by E-man930 View Post
    Thanks for the advice, I definitely will take note - just hate letting go of my UBR, which balances out my SBR quite nicely.
    I run an STR on my A5 setup. If they made a 'UBR-A5', I think I would put down the cash for it. It's a straight slick setup, to be sure.

  9. #29
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    If you want to consider an adjustable gas block, the Syrac Ordnance Low Profile unit is very good and will fit under your rails. The adjustment is variable in increments and is very secure at each position by virtue of its design.

    By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest. - Confucius

  10. #30
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    You know I would consider a detent locking adjustable gas block if it was a conversion using the KAC double pinned micro gas block currently on my rifle... If you offer this service let me know, i would be happy to pull my block. Also, why is the protruding detent not centered above the screw?
    Last edited by E-man930; 07-20-12 at 19:46.

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