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Sig MCX Versus AR15

7K views 18 replies 10 participants last post by  MarkCO 
#1 ·
I always liked the way the Sig MCX looked. Also I like light weight guns and the Sig MCX is that. It has its disadvantage's not being an AR15 and would be harder to get parts for when parts wear and break. I have an AR15 the Colt LE6920 MPS-B and its around 6.85lbs. The Sig MCX is one of those rifle's that nutnfancy liked on youtube. It has a short stroke piston design so it stays cleaner. I have not held one or seen one in a gun store yet. The MCX is pricey and In wondering if the cost is a bit too high for what it is. Anybody ever handle or fire a Sig MCX?? Thanks
 
#2 ·
I always liked the way the Sig MCX looked. Also I like light weight guns and the Sig MCX is that.
It weighs about the same as many AR15's. There are some that will be heavier and some that will be lighter.

It has its disadvantage's not being an AR15 and would be harder to get parts for when parts wear and break.
This is true.

I have an AR15 the Colt LE6920 MPS-B and its around 6.85lbs. The Sig MCX is one of those rifle's that nutnfancy liked on youtube.
Well, you already have two ARs, so looking for something different would be appealing. Yes, nutnfancy does love the MCX.

It has a short stroke piston design so it stays cleaner.
It doesn't stay cleaner - it just gets dirty in a different part of the rifle.

I have not held one or seen one in a gun store yet. The MCX is pricey and In wondering if the cost is a bit too high for what it is. Anybody ever handle or fire a Sig MCX?? Thanks
Handled one and loved it - never fired one, but it is reasonable to assume it fires like any piston AR with maybe a bit less felt recoil. The Virtus has a better trigger and (IMO) a better hand guard, but the original has a lighter barrel.
 
#3 ·
It weighs about the same as many AR15's. There are some that will be heavier and some that will be lighter.


This is true.


Well, you already have two ARs, so looking for something different would be appealing. Yes, nutnfancy does love the MCX.


It doesn't stay cleaner - it just gets dirty in a different part of the rifle.


Handled one and loved it - never fired one, but it is reasonable to assume it fires like any piston AR with maybe a bit less felt recoil. The Virtus has a better trigger and (IMO) a better hand guard, but the original has a lighter barrel.
Do they make the original with the original style buttstock? I like that it folds as well. I don't see many AR's around 6lbs even. Now the price is quite high so not sure I'd buy it. But it interests me enough if I had some extra money. I did not like the military arms channel review of it though. Not AK like reliability or even AR type reliability. Apparently water affects its function although it was a cold day also when the guy tested it.
 
#5 ·
The MCX is listed at 6llbs on the Sig site. Loaded with a mag of 30 rounds who knows what it weighs. My Colt feels rather light until I put a mag in it with 30 rounds. I've been thinking of buying some 20 round mags. For home defense its highly unlikely I'm gonna need 30 round mags. I'll keep the 30 rounder's if and when crap hits the fan. I got 3 40 rounder's as well.
 
#6 ·
You seem very focused on the weight, but there's nothing magical about the MCX. Compare apples to apples and put a lightweight barrel and lighter furniture on your 6920 and they'll be practically the same weight. Not trying to dissuade you. If you really want the MCX, get it. But there's no secret about why it's lighter than your 6920. Personally, I don't think it's worth it. But I do buy only lightweight AR barrels now.
 
#12 ·
I've got the pistol. A nice feature about it compared to an AR pistol, no buffer tube to contend with if you run the side folding brace. With that being said, have to be careful with the overall length with some brace set ups and tubes if ur gonna fold. On mine I'm running a non folding aftermarket adater w a SB Brace and SB tube and kept me under 26 1/2". Other alternative is SB's telescoping brace for the MPX/MCX.

Still yet to shoot it, just wanted something different but I have fallen in love w the MPX's, have 2 of those and a hoot to shoot.
 
#14 ·
When I can get a brand new Colt LE6920 for $950 its hard for me to justify the Sig's price even though its a short stroke piston gun. Direct Impingement isn't that bad unless I was lazy with my rifle's. I think I'm gonna start looking for an AK74s. I really like that particular gun and their not a whopping $1,800 but they have great reliability and pretty good accuracy, much better than the AK47.
 
#18 ·
I have a couple of Sig 516 piston AR's that I like quite a bit. The MCX is an interesting and to me appealing design. But, Sig has an unproven history of supporting these products over a long time period. My 516's have been completely trouble free, but I wonder if down the road Sig will be there to support them if needed. Same with the MCX. I might buy one, but it is definitely a proprietary design (sort of like Apple) that if Sig decides to abandon, then you are out of luck.

Any future AR purchases that I make will either be cheap (Ruger 8514) or something in the DD or FN category in DI.
 
#19 ·
SIG makes good optics, and decent pistols. I avoid their long-guns.

The MCX, I have seen several of them in classes and matches, and they tend to run okay, but they do go down more frequently than the AR15s. The MPX were all the rage for PCC, until the round counts got up, then they started to fail and have lost ground to the AR pattern PCCs, even though they shoot a little softer.
 
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