r/SigSauerMCX

MCX Rattler vs Rattler LT

I just got into the MCX Rattler. I really enjoy the look of the old school or original Rattler with the really short handguard. I collected handguards and parts for certain variants. I have an old Legacy MCX that I have acumilated a few of the Legacy handguards. I wanted to know if anyone has an original rattler and the new LT rattler and if the old small handguards work on the new LT version.

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u/Evrydyguy — 4 days ago

Sig rattler LT stock recommendations

I just SBR my rattler LT. Looking for stock recommendations.

u/fsufan9399 — 6 days ago

My 4th LVAW rail. And I don’t even have a spear Lt. I just like collecting unobtanium lol.

Been able to get at least one from each space magic drop 👌🏻 it’s really not as difficult as people complain about.

u/Opening_Fish_7631 — 6 days ago

My agency trade in MCX SBR from Blue Mountain Supply

Luckily for me, my 11.5 mcx virtus sbr I purchased from Blue Mountain Supply turned out to be in really good condition. Its unfortunate the other use that posted here that ordered one from the same lot and vendor got one that was literally cooked with rust, wear, and a firecracked barrel. Mine looks practically unissued. The turn around time from purchase to having it shipped to my ffl was slow, but the rifle arrived in better condition than I expected. The only notable damage is on the left handguard, it looks like it either fell from a moving vehicle or somebody ate concrete with it slung across their chest. Besides that the feed ramps, barrel, fcu, cam path channel, bcg, and firing pin almost look brand new. It’s sad and unfortunate for the other user who didnt get the luck of the draw with their purchase.

u/swooshZ0691 — 6 days ago

Space Magic LVAW Handguard

3rd times a charm right? Not. Space Magic Industries, what even does this mean? Look at the timestamp, this was maybe 15 seconds into availability, I was logged in, zip, zilch, nada....

u/craigulator — 7 days ago

New spear Lt owner

Good morning! I recently bought a spear Lt 16 inch from Sportsman’s and finally got the chance to open it up to get it lubed for an upcoming range day, while I know that most if not all manufacturers do test fire guns before they leave the factory , I was curious as to how many rounds they fire through them. When I wiped it down I noticed that it seems to have a noticeable amount of carbon fouling around the area where the charging handle is inserted into the upper receiver, enough to make the tip of the qtips I use pretty dirty ( not super black but enough to make them darkish gray) and when I rack it I can smell the spent powder. I’m sorry if this is a stupid question this is the first new rifle I’ve bought and I’m fairly fresh to the firearms community I just wanted to make sure this is normal and that I didn’t somehow get a used rifle at a new rifle price.

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u/Lopsided_Mud6267 — 7 days ago

Behold! My Stuff.

Received my 16" Virtus barrel last week and test fit it today to take some measurements for D. Wilson chopping it. I'm torn between 10.5 and 11.5. I'm leaning more toward 11.5 so I can shoot it unsuppressed, and the muzzle device is completely outside my LVAW handguard. I know the gas adjustment will be covered either way, so just looking for input. I know the manufacturer of the J. Bennet Omega Valve is in this group. I plan on getting a 5.56 MkII. Hopefully, in black, if you do that eventually.

u/TheRealMatchGrade — 7 days ago

As designes arc fire

Does it look like I need to run a lever blocker with this Giessele trigger? Im trying to figure out why I cant get this arc fire to run.

u/No_Scratch9818 — 8 days ago

I made the rear sling mount anti-rotation

Seriously Sig, why didn’t you make the rear sling mount anti-rotation?

u/Prizz117 — 11 days ago

JB Designs OMEGA Valve Mod. 2 MKII

OK, new MCX Spear LT 9" 300 BLK build/owner.....
....all complete/mod but need guidance on Mod 2 MKII.
I am on the email wait-list for MKII but wanted to post.
I have/use Q Blind Tiger on this setup and run Freedom HUSH 220gr Subs.
The stock MCX gas "-" settings works sometimes and the "+" 100% with this ammo/setup....
....but the latter clearly too strong and gassy.
Waiting on SilcencerCo GDCH to re-stock too....has good gas reduction success on my MPX using it.
For MPX the combo of 20% stronger springs + GDCH worked w/ stock barrel + OEM gas plug.
I know my MCX 9 (no way add stronger recoil springs) will need more adjustable gas block.
....so led me to Mod 2. MKII.
My post is How-To on it......

  1. How to install ?
  2. What are the port hole sizes for each setting ?

I ask because for MKII (300BLK) is seems on surface the reduced 3-position is only adding the OFF for me ?
I wrote down prior that MCX is (-) 0.0450 & "+" 0.0620 ....not sure accurate but in my notes.
My desire for use of MKII is gas blow-back reduction/tuning, not cycling.
Mod. 2 MKII (300BLK) is a departure from its Mod. 2 predecessors. Instead of four positions

  • Supersonic, high pressure ammo
  • Subsonic, low pressure ammo
  • OFF
  1. What setting to start/try ?
  2. What jet screw comes with it and/or what jet screw should I order as alternate ...if you can expand on how jet screw works would be appreciated too...
  3. Should I buy gas ring to help ?

Thx in advance.....want to do some ready while I wait 😫 for re-stocking......

Regards.

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u/SupermarketQuiet1105 — 14 days ago
▲ 28 r/SigSauerMCX+3 crossposts

Mcx rattler 200 yards CAT MOB

Some old footage, surprisingly the CAT MOB ti hub does a smidge worse than a cgs hyperion on this host. Which is fantastic for the weight size etc.

youtu.be
u/karmareqsrgroupthink — 14 days ago

MCX-SPEAR LT IR 300 BLK 9" with polonuim 30

Hello all! I'm looking to upgrade my 300 blackout rifle to the spear. Will be my range toy. My current rifle has a OCL Polonuim 30, that will go on the spear when I decide to get it. People who run/ran the polo 30 is it too gassy or any other issues? Thank you in advance!

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u/DemandMost5389 — 14 days ago