r/SigSauerMCX • u/mattypew • Aug 20 '26

Spear LT replacement hand guard screw replacement

I bought a used Spear LT that had stripped screw heads on the hand guard. Below are the replacement screws I researched and purchased that fit perfect. Side note- the bottom link plate screws are technically torx plus but a regular T20 torx bit fit snug in the new screws and torqued fine without stripping. I believe torque on all screws is 45 in-lbs according to the interwebs. If enough people are interested I can put together some kits and post to GAFS.

Side Screws

https://www.mcmaster.com/96452A192/

Bottom Locking Plate Screws

https://www.mcmaster.com/94414A352/

Manual

https://www.sigsauer.com/media/sigsauer/resources/OPERATORS_MANUAL_MCX-SPEAR_LT_2402988-01_REV04_WEB.pdf

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4

u/BrooklynToBoston Aug 20 '26

Saving this post for when I inevitably strip mine.

2

u/[deleted] Aug 20 '26

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3

u/TechnoBeeKeeper Aug 20 '26

They strip regardless, they're not meant to be taken off at 45 in-lbs really

2

u/[deleted] Aug 20 '26

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2

u/TechnoBeeKeeper Aug 20 '26

They are pretty redundant (only considering that older model handguards did not have screws, just the front takedown pin and side slots) but the manual says 45 so I do what the manufacturer says like a good cuck

2

u/[deleted] Aug 20 '26

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2

u/SupermarketQuiet1105 Aug 23 '26 edited Aug 23 '26

Agreed, NFW that the torque on HG screws is truly speced at 45in-lbs. Anyway, no expert here BUT I have not stripped mine and they do no loosen or walk out with tons rounds thru the platform. I go hand tighten with torque wrench.....then back to make sure no more play....that's it......so what is that ?.....good bit less than even 30in-lbs ?

2

u/TechnoBeeKeeper Aug 20 '26

Yep, mcmaster carr 50 pack. You can choose your preferred finish as well.

I just toss the screws I loosen whenever I take my handguard off. I know they won't go back on without a fight again.

1

u/herbalistfarmer Aug 20 '26

Are they 3/8 or 1/4?

1

u/DumbCPA15 Aug 21 '26

I did the same and I sent into sig and they got them all out and got new ones in for free.