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Posted: 2/17/2023 3:13:45 AM EDT
Comparison photos of three different barrel extension wrenches that are designed to be compatible with the SR-15.  No affiliation with any of these companies.  I just like tools, haha!

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Knight Stick:
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Sun and Shadow:
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Nefarious Arms:
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Link Posted: 2/17/2023 5:28:53 AM EDT
[#1]
The recent version of the Nefarious tool has additional machining features to my knowledge; your sample is no longer representative of what one currently receives.
Link Posted: 2/17/2023 8:50:00 PM EDT
[#2]
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Quoted:
The recent version of the Nefarious tool has additional machining features to my knowledge; your sample is no longer representative of what one currently receives.
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That makes sense.  As the one I have doesn’t even fit into an SR-15 barrel extension.
Link Posted: 2/17/2023 11:02:53 PM EDT
[#3]
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Quoted:


That makes sense.  As the one I have doesn’t even fit into an SR-15 barrel extension.
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So just to clarify, the current nefaious arms reaction rod does not work with the SR-15?  If so, what is the point, use a Magpul BEV and be done with it.
Link Posted: 2/17/2023 11:32:39 PM EDT
[#4]
I have the older original one, which does not fit.  I’m assuming the revised one does fit.
Link Posted: 2/18/2023 3:41:28 AM EDT
[#5]
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Quoted:
I have the older original one, which does not fit.  I’m assuming the revised one does fit.
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Details? I have a first run Nefarious Arms tool and used it on my SR-15, it was advertised with that compatibility in addition to HK 416.
Link Posted: 2/18/2023 1:31:42 PM EDT
[#6]
No idea. Mine does not fit. It might just be an edge on one of the lugs that needs to be filed down a very slight amount. I didn’t try forcing it into any of my SR-15s, as the Knights Stick and the Sun & Shadow tools I have just slide right in. I plan on reaching out to Nefarious Arms.
Link Posted: 2/18/2023 7:52:53 PM EDT
[#7]
That’s believable. The deburring and finish machining on a more recent one I saw were disappointing. I’d recommend everybody take off the o-ring and thoroughly clean the tool end for burrs etc.
Link Posted: 2/23/2023 3:05:58 PM EDT
[#8]
Good comparison.
Link Posted: 2/23/2023 6:47:50 PM EDT
[#9]
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Quoted:
Good comparison.
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Agreed!
Link Posted: 2/23/2023 9:20:01 PM EDT
[#10]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


So just to clarify, the current nefaious arms reaction rod does not work with the SR-15?  If so, what is the point, use a Magpul BEV and be done with it.
View Quote


The current one works with an SR15, HK416 and standard AR15 barrel extensions
Link Posted: 2/26/2023 11:21:46 PM EDT
[#11]
OK thank you for the clarification.  I thought that was the case but your post was concerning.  Cheers.
Link Posted: 3/26/2023 3:47:21 PM EDT
[#12]
newest nefarious arms needs to be deburred before use. and to corroborate it's a good and tight fit in normal extensions.

ithinking a guy could run an LMT enhanced bolt in  the e3 extension and be golden.
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