New LMT MWS firing pin spring

[Pappabear]

Via LMT's website: "Firing pin spring for our .308 BCG (LM308D and LM308DA). Intended to reduce the chance of slam fires when using match primers".

Anyone have information on this. I have a friend that just built an MWS and his new carrier had this spring in it. So I bought a few spares to put into my MWS BCG's.

Interesting huh. Jack you out there Buddy, does Knights have this?

PB

[sinister]

They've been in the Geneseo (now Arizona) Armalites since the beginning. The AR-10 / LMT MWS bolt carrier group is WAY heavier than the 5.56 AR's -- with the additional mass and spring that's a LOT of inertia.

Not really a big difference when talking about military primer cups. Federal Gold Medal Match primers may be a different issue.

[Pappabear]

They've been in the Geneseo (now Arizona) Armalites since the beginning. The AR-10 / LMT MWS bolt carrier group is WAY heavier than the 5.56 AR's -- with the additional mass and spring that's a LOT of inertia.

Not really a big difference when talking about military primer cups. Federal Gold Medal Match primers may be a different issue.

Sinister, do you think its a good thing or stupid?

PB

[sinister]

I think it's a good idea. Standard M4s and carbines can often leave a slight inertia dimple on primers from firing pin kisses. Again, the big-frame BCG is moving along with a heavier firing pin.

Armalite and Larue use them, and apparently LMT (with decades experience) is starting as well.

[BufordTJustice]

The LMT 308 E-BCG I grabbed in 2021 had the FP Spring.


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[markm]

I'll take a slam fire over a broken cam pin any day, but the spring sounds like a good idea.

[Pappabear]

I think it's a good idea. Standard M4s and carbines can often leave a slight inertia dimple on primers from firing pin kisses. Again, the big-frame BCG is moving along with a heavier firing pin.

Armalite and Larue use them, and apparently LMT (with decades experience) is starting as well.
Thanks for the feedback.
PB

[LMT/556]

My last BCG came with one. Joe said it was for match 6.5 CM, maybe Hornady ELDs and such. I've never had a problem with FGMM.

[Pappabear]

I bought some spares and installed in all 3 of my MWS guns. I had that one crazy explosion so I thought, I hope this helps...maybe.

PB

[Korgs130]

I bought some spares and installed in all 3 of my MWS guns. I had that one crazy explosion so I thought, I hope this helps...maybe.

PB


I missed this when you posted about the springs in December. I had a slam fire with with my MWS and a round of Federal Gold Medal Sierra MatchKing 7.62x51mm NATO 175 gr ammo about 2 years ago. I just placed my order for a spring.

[markm]

For what it's worth, two springs won't fit in a single BCG. :fie:

So if you forget you already have one installed... ;)

[crosseyedshooter]

Now I gotta find something else to buy so I'm not paying $15 shipping for a $3.50 spring. Anyone got suggestions?

[Pappabear]

Now I gotta find something else to buy so I'm not paying $15 shipping for a $3.50 spring. Anyone got suggestions?

Buy two, spread the shipping. Lol. It’s still cheap
Insurance with that ****ed up shipping.

Or you could shop the internet and find another seller.

PB

[crosseyedshooter]

While searching for the apparent part number, "CS037-M2-S17", I ended up at a spring manufacturer's website (https://www.smalley.com/wave-spring/cs037-m2). Anyway, just thought I'd throw it out there.

70135

[Pappabear]

While searching for the apparent part number, "CS037-M2-S17", I ended up at a spring manufacturer's website (https://www.smalley.com/wave-spring/cs037-m2). Anyway, just thought I'd throw it out there.

70135

Did you order from them? Looks like a mass mfg type site. Ie they build one for you then you buy 10,000

Try V1 tactical, they stock a lot of LMT gear, mucho.

PB