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Question about using the KAC Knightstick

EnablerNo1

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Joined: Aug 2003

Posts: 9098

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MP, USA

Posted: 8/31/2026 9:58:00 PM EDT

Stupid question, but humor me and I appreciate any guidance.

I bought a Knightstick from Operation Parts. These are listed as being used for the SR15 and SR25. When I insert it into my APC upper, it doesn’t seem like it fully seats into the locking lug recesses and there is some rotational play. Is this normal?

Nobody69s

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Joined: Nov 2014

Posts: 9654

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USA

Posted: 8/31/2026 10:14:05 PM EDT

[#1]

Does the APC barrel extension have rounded lugs like the Knights ones?
If not, probably not a good idea.

EnablerNo1

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Joined: Aug 2003

Posts: 9099

EE: 100% (33)

MP, USA

Posted: 8/31/2026 10:31:44 PM EDT

[#2]

Quote History

Originally Posted By Nobody69s:
Does the APC barrel extension have rounded lugs like the Knights ones?
If not, probably not a good idea.

View Quote

It’s a KAC SR25 APC.

PresampleDepot

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Joined: Nov 2019

Posts: 376

EE: 100% (3)

TX, USA

Posted: 9/1/2026 11:33:12 AM EDT

[#3]

Yes sir that is normal.

You're good to go. Please remember the KAC Knightstick is really only for MD swaps and removal of the Mod 2 castle nut.

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KAC Dealer | Armorers | 07/02

Nobody69s

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Joined: Nov 2014

Posts: 9655

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USA

Posted: 9/1/2026 3:35:22 PM EDT

[#4]

Quote History

Originally Posted By EnablerNo1:

It's a KAC SR25 APC.

View Quote

Oh ha!
Excuse my ignorance on this.

EnablerNo1

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Joined: Aug 2003

Posts: 9106

EE: 100% (33)

MP, USA

Posted: 9/1/2026 8:33:53 PM EDT

[#5]

Quote History

Originally Posted By PresampleDepot:
Yes sir that is normal.

You're good to go. Please remember the KAC Knightstick is really only for MD swaps and removal of the Mod 2 castle nut.

View Quote

Great, thank you!

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Question about using the KAC Knightstick

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Question about using the KAC Knightstick

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Question about using the KAC Knightstick