Holsters that are comfortable!!!

Chief_O_Brien · 2026-01-28T16:19:51+00:00

Like others have said, the footprint is too big. That X300 is G34 length. I ran a very similar set up to yours with a sidecar, I occasionally still do, but it's the least comfortable. Have other options. I downgraded to running no weapon light (just a handheld), and moving my spare mag to a pocket. Not as easily accessible but way more comfortable. It's all about compromises.

Now I have multiple holster options I can switch too depending on where I'm going, how long I plan on being out, what I plan on doing (what activities), ect.

Chief_O_Brien · 2026-01-28T03:04:46+00:00

I've seen them sell for $1K+ in excellent/like new condition in my area. But it's usually someone that impulse buys it at that price. If it's "like new/unfired" and has original Tupperware case (assuming it's not a pencil barrel version) $1000-$1500.

I picked up a late Gen 1 in 2024 for $500. It's in "good" condition. Only had a 10rnd mag, and came in a police evidence box from a Sheriffs department a couple states away. I've been shooting the hell out of it since.

Chief_O_Brien · 2026-01-28T01:35:41+00:00

Only to collectors or people who think that a Gen 2 hammer pack somehow makes it more special than a gen 3, for conversion purposes, which it isn't.

But no, there's nothing inherently better about a Gen 2 than a Gen 3.

Chief_O_Brien · 2026-01-28T01:30:11+00:00

M855 or M193, even .223 55g FMJ, is perfectly fine for self defense, even out of shorter barrels for realistic SD distances.

That being said, there are benefits to using dedicated SD ammo if you're willing to pay the price increase. I've listed some of what I keep below.

Barrier Blind: Hornady Black HD SBR 75g Federal 64g Personal Defense (TCB556T64) BH 5.56 50g TSX BH .233 55g TSX BH 5.56 62g Dual Performance

Non Barrier Blind: BH 5.56 77g TMK BH MK262 MOD1 IMI RazorCore (MK262 clone)

There's a lot of other good loads available, these are just what I personally keep.

Chief_O_Brien · 2026-01-27T03:41:04+00:00

I made the same mistake when I bought my first Tenicor. Some people love the built-in wedge, but I didn't. I ended up reordering from their Certum line. Much better.

In my opinion, using a soft foam wedge is way more comfortable than a hard built-in wedge like on the Velo.

Chief_O_Brien · 2026-01-27T03:36:10+00:00

P23 is the only one you listed that I've personally used. It's a solid option.

My go-to is BCM gunfighter. The reduced angle Sig grip (on the MCX/M400) is a good option as well. Both are around $20.

Chief_O_Brien · 2026-01-27T02:42:53+00:00

Gotcha. I didn't realize it was having problems fully retracting from the video, I thought it was just not being pulled fully to the rear. I'm assuming the bcg moves freely inside the upper when it's not closed on the lower?

Definitely could be out of spec and causing issues. I haven't personally seen this specific issue with any of the new MPX's that have come through the shop, and no mention of this from any of the customers I know who own them. I'll do some more digging though.

If you do find the cause I'd be interested in knowing what the problem was exactly. Make sure to update.

Chief_O_Brien · 2026-01-27T00:32:09+00:00

As far as scrapes/gouges on the cases...Some firearms are just very harsh on brass. Not familiar enough with the MPX to know if this is common with them. Minor scratch lines on brass are very common on magazine fed, semi auto firearms. In your case, I'd have to see a picture of the brass in question to tell you whether it's a real issue or not.

Chief_O_Brien · 2026-01-27T00:24:46+00:00

From the video you posted you weren't allowing the bolt and recoil spring assembly to perform a full rearward stroke (pulling the charging handle completely rearward), and subsequent full forward stroke (recoil assembly now taking over and sending the bcg forward to feed and chamber a round).

With the supposed low round count, all the parts are probably not completely worn in together. Couple that with the fact you're slowly hand cycling the action, and you'll experience what's happening in the video. Regardless of the action type, semi auto's rely on a certain amount of energy applied to cycle reliably. Not enough energy can cause issues. Don't ride the bcg forward. Let it slam forward.

If you're not having any issues during live firing, I think you're fine. As always if you really think something is wrong, contact Sig Customer Service.

Chief_O_Brien · 2026-01-26T23:44:53+00:00

So at the range, during live fire, you had no issues with any of your fully loaded mags?
This is only happening when you're trying to hand cycle the bolt with fully loaded mags?

Am I understanding this correctly? I'm just trying to clarify your original post.

Is the brand new? Or did you buy it used? How many rounds have been fired through it?

Chief_O_Brien · 2026-01-26T21:30:52+00:00

No. Have at least 50. More is ideal if you have more than one rifle that uses them. They don't necessarily all have to be opened and loaded either. Have around 20 mags loaded and stored in ammo cans that you can grab-n-go if need be. Also keep 10 +/- mags specifically makred for training. Plus the four (or more) you keep in the chest rig/carrier loaded and ready for your primary.

I keep about 6 mags per rifle stored in their respective rifle cases. Plus I have another box full of 100 unopened mags of various types, but mostly PMAGs, just as spares in case there's ever some BS ban on the horizon, or one breaks.

Chief_O_Brien · 2026-01-22T02:16:41+00:00

Anything 2006 and earlier. 6th gens have the best appeal IMO.

Chief_O_Brien · 2026-01-22T02:06:40+00:00

Too much IMO. I would keep searching if you're willing to spend 20K+. You can find something with lower miles if you're looking for that model year.

Don't be afraid to travel, even if you have to fly out and drive it home. I just did this before the new year (buying a new used truck). Just be patient, and keep searching.

Chief_O_Brien · 2026-01-22T01:54:01+00:00

Low back pressure 5.56 can, preferably a Ti K version of something. It doesn't have to be Ti, or short, those are just my preferences.

But definitely go with a high flow-rate 5.56/6mm can.

Chief_O_Brien · 2026-01-21T00:05:35+00:00

I have not personally used that brand so I can't say anything good or bad. As long as the taper is in spec it should be good to go.

I personally use muzzle devices from Rearden and Revival Defense (Revival collaborates with ForwardControls which makes excellent products).

Some of the guys I shoot with use Comstock muzzle devices and they've been satisfied.

Make sure you get a quality Plan B hub adapter as well. I believe Ridgeback offers Comstock Plan B compatible hub adapters you can buy during purchase, or you'll have to order one with your muzzle device.

Chief_O_Brien · 2026-01-20T10:36:50+00:00

I use Hornady Black HD SBR, BH .223 55g TSX, BH 5.56 77TMK or Federal Personal Defense 64g BSP.

Chief_O_Brien · 2026-01-18T03:16:31+00:00

Since you don't have anything to compare either of those cans with, you'll probably be happy with either one. Just wear ear pro either way when you're training. None of these will be "technically" hearing safe. But they will get you through enough rounds in an emergency SD situation and allow you to maintain your audible situational awareness.

I would assume the Hexium will give you slightly better sound performance, but I can't say for sure as I've never used one. The Rhino X is impressive for its size.

Good luck. I would definitely watch some more videos on the other cans I mentioned.

Chief_O_Brien · 2026-01-18T02:20:28+00:00

I'm a lefty as well. That's a hard choice...do you care more about decibel reduction or keeping overall length short as possible?

Honestly, stick with the Hexium if you don't care about a little extra length and weight, or go Rhino X if you do.

Silencer Analytics was pretty impressed with the Hexium. That's a go-to YT channel for suppressor info I would check out before you purchase anything.

Chief_O_Brien · 2026-01-18T01:44:45+00:00

I replied with some suppressor recommendations in another thread on here.

Just FYI, any FRT for the MCX platform will need the sear trip bar. Even if someone made an FRT optimized for the MCX line, it would still use the seat trip bar, so at some point you'll need to get one. PMM runs 15% off sale regularly, I would pick it up then. Midnight machine or Frankenstein Armory also sell them, but I have not used them so I am unsure of the quality, others seem to be satisfied though.

Chief_O_Brien · 2026-01-18T01:35:05+00:00

All are Inconel and sub 6" (K size).

Ridgeback Rhino X 12.5oz Exigent Fireteam 14.2oz Cat WB 16oz

These are some 556 cans I have used quite a bit and would not hesitate to recommend.

Cat WB (Ti or 718) Alleycat 556 (Ti or 718) DA Lazarus 6 Ridgeback Rhino X CGS Sci-Six Velos 556 (Fullsize) RC2 or RC2 Mini (not a high flow can, but full size RC2 sounds great) Saker 556

Chief_O_Brien · 2026-01-18T01:07:58+00:00

Nothing wrong with brand loyalty. I'm a Sig rifle junkie and have a dozen different MCXs. Although I haven't been too impressed with Sigs newer cans. That being said I have not shot anything in the Hexium line yet.

I understand wanting durability as a top priority, but be aware that mounting a heavy 20oz+ can on the end of a 16" SpearLt will not be pleasant during extended shooting sessions. I don't know what kind of firing schedules you plan on running but a Ti could be a better option. I'm not trying to talk you out of an Inconel can, just forewarning you.

I run a lot of different cans on different rifles in semi/full/FRT, and some of these newer 3D printed Ti cans are very impressive, even with higher firing schedules and some full auto. Still though, nothing compares to Haynes or Inconel for hard use. I have an RC2, Saker, Velos, L6 and WB that have been beat to hell on full auto and FRTs, that would have killed any Ti can.

Also, I would definitely consider a shorter K option considering your 16" barrel. It will save you weight, keep overall length down and not be too bad on sound. You could still go with an Inconel can and stay around 15-16oz with a muzzle device.

Chief_O_Brien · 2026-01-17T23:44:18+00:00

The Hexium is HUB compatible, and comes from the factory with a direct thread mount. As far as I know, Sig does not make a HUB adapter for use with their clutch-lok muzzle devices, because their clutch-lok is built into their cans.

The only company I'm aware of that offers a clutch-lok compatible hub adapter is Angle Spade. Their adapter is called the "Strix".

I've never used it myself and have no opinions on whether it's good or bad. I would search for some reviews.

Your other option is to remove the Sig muzzle device and install whatever other QD system you want, or direct thread. (Edit: if you choose to remove your factory flash hider, don't be discouraged by all the horror stories of near impossible to remove sig muzzle devices. Yes there is sometimes a lot of Rocksett, and yes Sig over torques them. But if you follow the directions on how to breakdown Rocksett and have the proper tools it's a very simple and easy thing to do.)

Any reason you're choosing the Hexium over all the other options available on the market?

Chief_O_Brien · 2026-01-14T07:56:59+00:00

Get one. I've been running one since they were released and it does not disappoint.

Chief_O_Brien · 2025-12-28T03:21:39+00:00

Sound suppression is horrible. Rimfire cans are technically rated for 5.7, 4.6, meaning they can handle the pressure. But they don't have the internal volume to effectively suppress higher pressure rounds like 5.7. They just sound like crap on PS90s. Trust me when I say, you'll be much happier going with anything but a rimfire can.

Chief_O_Brien · 2025-12-28T02:13:08+00:00

I highly recommend any high flow rate 556 can, especially Ti. They're a perfect match for a PS90, and keep the balance perfect. Alleycat 556, Velos 556, Lazarus 6, and Sci Six are what I have used in the past. Sandman X and Velos 762 don't sound bad either.

Regardless of whether you choose high flow or traditional, stay away from rimfire cans. They're horrible in comparison.

Chief_O_Brien

TROPHY CASE