There's a lot of bullshit out there when it comes to AR pistols. They aren't accurate, .223 becomes .22 WMR out of a short barrel, they're just a range toy, etc.
I picked one up the other day and finally got a chance to shoot it this afternoon. It worked about like I thought it would. It's a bit louder than my carbine, it occasionally makes a big fireball, but other than it shoots and functions just like any other AR.
Chrono Data
Gun Specs:
Rock River LAR-15
7.5" barrel
5.56 chamber
I usually throw these in Excel and calculate the avg and what not, but I'm lazy today and I don't really care that much.
Monarch Brass 55gr FMJ
2457
2438
2460
2414
2452
2432
Lots of fireballs observed, but the most consistent load by far. Good accuracy.
Fiocchi 40 gr V-MAX
2213
2169
2108
Disappointed with this load. I was hoping to see the highest velocity with this lighter bullet, but it appears to be the weakest load of all of them.
Remington UMC 55gr FMG
2397
2354
2395
XM193
2220
2174
2140
My "Zombie Load" 25.3gr Ramshot TAC under Hornady 75gr BTHP
2220
2174
2140
Herter's 55gr FMJ (steel case)
2300
2340
2297
I'd like to know where you can get .22 mag with those specs because I would buy a truckload of it.
Only two loads were actual 5.56 loads, so there's definitely more potential power.
The Tradeoffs
Obviously velocity does take a hit due to the short barrel, but there's tradeoff calculus here. Velocity goes down, but maneuverability in tight spaces goes up, and weight goes down. With the the right bullet, we can negate some of the effect of low velocity as we aren't limited to FMJ.
Summary
I would have no qualms about using this pistol for home defense, and it may just become my home defense gun after some more use.
I picked one up the other day and finally got a chance to shoot it this afternoon. It worked about like I thought it would. It's a bit louder than my carbine, it occasionally makes a big fireball, but other than it shoots and functions just like any other AR.
Chrono Data
Gun Specs:
Rock River LAR-15
7.5" barrel
5.56 chamber
I usually throw these in Excel and calculate the avg and what not, but I'm lazy today and I don't really care that much.
Monarch Brass 55gr FMJ
2457
2438
2460
2414
2452
2432
Lots of fireballs observed, but the most consistent load by far. Good accuracy.
Fiocchi 40 gr V-MAX
2213
2169
2108
Disappointed with this load. I was hoping to see the highest velocity with this lighter bullet, but it appears to be the weakest load of all of them.
Remington UMC 55gr FMG
2397
2354
2395
XM193
2220
2174
2140
My "Zombie Load" 25.3gr Ramshot TAC under Hornady 75gr BTHP
2220
2174
2140
Herter's 55gr FMJ (steel case)
2300
2340
2297
I'd like to know where you can get .22 mag with those specs because I would buy a truckload of it.
Only two loads were actual 5.56 loads, so there's definitely more potential power.
The Tradeoffs
Obviously velocity does take a hit due to the short barrel, but there's tradeoff calculus here. Velocity goes down, but maneuverability in tight spaces goes up, and weight goes down. With the the right bullet, we can negate some of the effect of low velocity as we aren't limited to FMJ.
Summary
I would have no qualms about using this pistol for home defense, and it may just become my home defense gun after some more use.

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