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

  1. #41
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    Emailed SpringCo and they changed my order to three green rifle springs just in the nick of time. UBR is off to another member for his build - here is what happened today...

    Ignore the shop dog, he insisted that he had to be in the garage while I was working on the rifle. Later he became cranky because I kept pounding away at things (buffer pins / staking the castle nut) with a mallet and disrupted his sleep several times so he decided to point his ass toward me. When I have some time in the next day or so I'll edit the post to make it look a little nicer and maybe add come additional comments. I'll report back Friday after a trip to the range for a 300 round session.





















    Last edited by E-man930; 08-09-12 at 17:48.

  2. #42
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    Cleaned the counter to make way for gabuzz12's KAC gun since he lacks the tools to swap out his RE. I'll let him post any pics from his swap on his own time.
    Everyone thank you for the solid advice on the A5 system - can't wait to go blasting tomorrow and see how she does. The pics above showing the buffers pulled apart was to build a H3A5 buffer from the one Vltor shipped with the kit and my now defunct H3 BCM buffer. Swapped in one tungsten weight in place of a steel weight did the trick and brought the buffer up to the weight Vltor advertises for their A5H3. I will try some weak sauce .223 ammo for the hell of it tomorrow just to see how much margin I have in the system.

    Last edited by E-man930; 08-09-12 at 20:21.

  3. #43
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    Not sure if anyone gives a rats ass anymore but if someone does I can post up my range session results from today. (420 rounds XM193)
    Short answer is my gun now runs like a Columbian prostitute to the local police when the U.S.S.S. is in town...
    Last edited by E-man930; 08-10-12 at 22:45.

  4. #44
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    Quote Originally Posted by E-man930 View Post
    Not sure if anyone gives a rats ass anymore but if someone does I can post up my range session results from today. (420 rounds XM193)
    Short answer is my gun now runs like a Columbian prostitute to the local police when the U.S.S.S. is in town...
    Looks bitchin', man. Thanks for posting.
    We miss you, AC.
    We miss you, ToddG.

  5. #45
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    Quote Originally Posted by E-man930 View Post
    Not sure if anyone gives a rats ass anymore but if someone does I can post up my range session results from today. (420 rounds XM193)
    Short answer is my gun now runs like a Columbian prostitute to the local police when the U.S.S.S. is in town...
    I give a shit.

    Glad to hear it brother. Enjoy the A5 kool aid.

    Sent from my Samsung Galaxy Epic 4G Touch
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  6. #46
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    Thanks Magic & Buford - I felt like I was starting to bother folks if I kept posting updates... Range session went very well - I brought a 500 round can of XM193F and about 60-70 rounds of mixed .223 ammo that I somehow managed to accumulate over the past 4-5 years. I ended up firing 420 (+/- 5) rounds of the XM193F and all my misc .223 ammo over the course of 2.5 hours with a few breaks in between to let things cools down. I would say that of the rounds I fired yesterday, 350 or so were suppressed and the gun ran like a sewing machine. The ejection angle with the suppressor was @ 2 with the brass going about 7 feet and all landing in the same spot on the range floor; without the suppressor, the brass kicked out @ 4 about 4 feet from me in a neat little pile. The gun was tested for lock back as follows:

    - 15 tests XM193F + can = 100%
    - 15 tests XM193F no can = 100%
    - 15 tests .223 mix ammo + can = 100%
    - 15 tests .223 mix ammo no can = 80% *

    * 3 failures to lock back used Remington 55gr UMC .223 noted

    The ammo I selected for the .223 no can lock back test out of the grab bag was as follows: 5 rounds of Hornady 75gr TAP, 5 rounds of Hornady .55gr SP, and 5 rounds of Remington 55gr UMC. The BCG did lock back twice with the UMC so I get the impression that it is right on the edge of locking back with the weak ass ammo I had to try. It cycled everything with zero issues and felt ridiculously smooth with no recoil impulse without the can and felt very smooth and brisk with it. I even held the rifle (without the can) loosely by the pistol grip out in front of me and tried to see if I could get it to fail to pick up any rounds using a mixture of whatever was left in .223 and a few 5.56 rounds mixed in a 30 round P-mag and it didn't give a shit. Tried 5 more lock back tests using this hold and XM193 and it arrogantly just kept locking back as if to say F-you.

    I am very happy with the result. I never cleaned the upper when I received it from LawMen's, just stripped and lubed. I never cleaned it nor added lube the whole time I fired it up until last night. I estimate the gun ran about 950 rounds (including a range session when I first received the upper), of which 650-700 rounds were fired suppressed. The Vltor A5 system has about 420 rounds of XM193 and lets say 60 of .223 mixed ammo, 350 of which was suppressed. I'm calling it good at this point.

    Worthy of separate mention is that I did have one parts failure at the range as seen in the pics. My bolt catch allowed the bolt to slam home on its own a few times at the end of the session. I made note of this to check things over when I got home. During dis-assembly I found the bolt catch chipped where the bolt hits it to stop the BCG from cycling on an empty mag. While staring in disbelief I then had a realization of why this happeend. Two or three years ago I removed the bolt catch from this lower (bought it stripped and completed with a G&R parts kit) for prototyping purposes for a failed business venture that went no where and never got the bolt catch back from my ex-partner. When I ended up building the lower out for a back up rifle a few months later I looked everywhere online for parts and only found one place that had any in stock. So, I ordered a DPMS bolt catch from Brownell's to get my lower functional again to continue with my build and told myself that later I would replace it with a LMT catch from Grant or a Colt catch when they were in stock. Well I forgot about that little bugger until yesterday... Surprise, surprise huh? I laughed at myself for wasting money and quickly popped in a new LMT catch from my spare parts bin. I have learned my lesson to never ever buy shit parts again, even in a pinch, and consider myself lucky that this is my only experience with DPMS.

    Last thing to note is that Frog Lube does one hell of a job of breaking down carbon and all of the crap that caked itself all over the operating components of the gun. I wiped the parts off with a blue shop towel and then let them sit in a tub covered with Frog Lube CLP. A few hours later I scrubbed them with a nylon brush (brass brush for the bolt) then wiped all of the components clean with another blue shop towel. They turned out so freaking minty new looking that I ended up re-cleaning and stripping the rest of the damn gun down to get it just as clean. (Way to go FrogLube!) Rifle is now back together all lubed up ready for more blasting.

    And now the pics...
















    Last edited by E-man930; 08-12-12 at 16:34.

  7. #47
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    Last edited by E-man930; 08-11-12 at 15:07.

  8. #48
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    Awesome thread and awesome rifle! I wonder how much (and for how long) the DPMS bolt catch was contributing to the problems.

  9. #49
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    Thanks, the only problems the DPMS bolt catch would have caused would be related to locking the bolt back. It may have contributed to the three failures to lock back with the UMC ammo but I can't say for sure when it failed, other than it was this last range session. It was no longer able to reliably hold the bolt carrier back once it chipped... More than likely this is due to an improper heat treat that made the steel too brittle.

  10. #50
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    Well guys....

    I haven't posted in this thread since Eman930 and I had our initial problems with the malfunctions using the factory KAC SR15 rifles and our AAC 762SDN6 suppressors. Eman930 has fixed his problems; HOWEVER, I can't seem to get my rifle up to speed. Using the advice of other members, I have installed the Vltor A5 system and a Springco "green" rifle spring. Here's goes my frustrating effort to fix this over-gassed issue:

    Please keep in mind all ammo used during this test was Federal XM193.

    Step 1:

    I installed the Vltor A5 System and used the stock weight buffer and Springco spring. I went to the range....fired approximately 35 rounds....and cursed uncontrollably as I had three malfunctions...all stovepipes. I can say that the A5 system caused the ejection angle of the brass to be more consistant at approximately 2:30.

    Step 2:

    In an attempt to increase the buffer weight to get the rifle to cycle properly, I added one additional tungsten weight and removed one steel weight. I (again) went to the range...fired approximately 35 rounds...and cursed uncontrollably as I had multiple malfunctions.

    Step 3: (Today's Range Trip)

    I added an additional tungsten buffer weight....now all the weights in the buffer are tungsten. I (again) went to the range...fired approximately 35 rounds...and cursed uncontrollably as I had multiple malfunctions.

    At this point, I am at my wits end with this KAC SR15! When Eman930 originally posted this thread, we were contacted by KAC, who promised new ejectors and springs. THESE NEVER CAME!! After multiple attempts at trying to get this person to send the parts....we gave up and tried to fix things on our own with the A5 system.

    My opinion is that I must have a barrel with a gas hole the size of a sewer pipe! I assume in KAC's attempt to satisfy the general public with their rifle's ability to cycle junk ammo, they have obviously ignored more of the higher-end user, which I was under the impression that the company catered to when I purchased my KAC products.

    I am beyond pissed at this point and am considering parting with all my KAC rifles because their products don't do what they claim. When I pay such a premium for products....I except them to work flawlessly without exception.

    Well guys....can you think of anything for me to try??? I'm all out of options...at least that I can think of. I would appreciate any help/comments that you can provide.

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