Low mass bcg

Jmac604

Jmac604

Regular
Rating - 100%
50   0   0
Location
Kamloops, BC
I was wondering if anyone on CGN has used them and, if so, what they thought of them? They seem interesting and I have read some positive reviews but I've also read they have can cause light primer strikes and fitting issues re upper....
 
Trinimon said:
Low mas BCGs can affect your rifle's timing. You'd probably want to combine this with an adjustable gas block.
Click to expand...

It's not the timing so much as the designed recoil impulse. By lowering the weight of the BCG you are screwing with the recoil forces the rifle is designed to handle. This can result in accelerated wear and catastrophic damage.
 
Suputin said:
It's not the timing so much as the designed recoil impulse. By lowering the weight of the BCG you are screwing with the recoil forces the rifle is designed to handle. This can result in accelerated wear and catastrophic damage.
Click to expand...

Wouldn't a low mass BCG theoretically lower the recoil, as there is less mass suddenly decelerating when it reaches the back of the receiver extension?
Don't get me wrong, I don't mess with low mass carriers because I try to stick to known quantities, but I am talking theory here. I would think that letting less gas into the gas tube (via adjustable gas block) + a low mass carrier would be a sound way to reduce recoil, maintain reliability, prolong parts life, etc. You can always play with the buffer spring and the gas block setting to accommodate different ammo, could you not?
 
Last edited:
Benito said:
Wouldn't a low mass BCG theoretically lower the recoil, as there is less mass suddenly decelerating when it reaches the back of the receiver extension?
Don't get me wrong, I don't mess with low mass carriers because I try to stick to known quantities, but I am talking theory here. I would think that letting less gas into the gas tube (via adjustable gas block) + a low mass carrier would be a sound way to reduce recoil, maintain reliability, prolong parts life, etc. You can always play with the buffer spring and the gas block setting to accommodate different ammo, could you not?
Click to expand...

Recoil = mass x velocity. Remove mass and the velocity must increase. The harder that BCG smacks the bottom of the buffer tube, the greater the recoil impulse that will be imparted into the rifle and your shoulder.

A lighter weight BCG is accelerated quicker and to a higher velocity by the gas system, which results in more recoil impulse.

In a pure blowback system, the weight of the slide or BCG is critical to the functioning of the gun. While an AR is not a blowback action, the BCG is acted upon by the gas system much in the same way a blowback pistol is, in that the carrier velocity is a function of carrier weight and spring rate.
 
Suputin said:
Recoil = mass x velocity. Remove mass and the velocity must increase. The harder that BCG smacks the bottom of the buffer tube, the greater the recoil impulse that will be imparted into the rifle and your shoulder.

A lighter weight BCG is accelerated quicker and to a higher velocity by the gas system, which results in more recoil impulse.

In a pure blowback system, the weight of the slide or BCG is critical to the functioning of the gun. While an AR is not a blowback action, the BCG is acted upon by the gas system much in the same way a blowback pistol is, in that the carrier velocity is a function of carrier weight and spring rate.
Click to expand...

Yep, so you would NEED an adjustable gas block, or reload specifically to your rifle. Most guys that put these in their rifles are looking for very specific things, so they're not shooting milsurp XM193 or XM855 or norc ammo.

With the few grams of material you'd save in weight, getting a carbon fibre handguard or something would make more sense. If it's recoil reduction you want, a brake or compensator to keep the gun from moving is the ticket.
 
So this would be something very user specific such as 3 gun?




F22_RaptoR said:
Yep, so you would NEED an adjustable gas block, or reload specifically to your rifle. Most guys that put these


in their rifles are looking for very specific things, so they're not shooting milsurp XM193 or XM855 or norc ammo.

With the few grams of material you'd save in weight, getting a carbon fibre handguard or something would make more sense. If it's recoil reduction you want, a brake or compensator to keep the gun from moving is the ticket.
Click to expand...
 
you need more than just a BCG, first of all you need to come with a specific ammo load you going to be shooting, than you build your rifle with the right weight spring and buffer as well. when you run a "lightweight setups" essentially you are running your rifle just at the edge of failure where it barely cycles to achieve that low recoil and fast follow up effect.

Frankly it is just another solution to a problem that really doesn't exist.
 
hbean said:
you need more than just a BCG, first of all you need to come with a specific ammo load you going to be shooting, than you build your rifle with the right weight spring and buffer as well. when you run a "lightweight setups" essentially you are running your rifle just at the edge of failure where it barely cycles to achieve that low recoil and fast follow up effect.

Frankly it is just another solution to a problem that really doesn't exist.
Click to expand...

For the average user, definitely. I can see the application for high lever competitors, but for most of us, there won't be any advantage to this sort of setup, and a number of distinct disadvantages.
 
Ar180shooter said:
For the average user, definitely. I can see the application for high lever competitors, but for most of us, there won't be any advantage to this sort of setup, and a number of distinct disadvantages.
Click to expand...

Hypothetically then...if one were to compensate the low mass bcg with the heaviest spring and buffer available for 5.56; is that sufficient for an 'average joe' fast and lightweight AR?
 
Jmac604 said:
Hypothetically then...if one were to compensate the low mass bcg with the heaviest spring and buffer available for 5.56; is that sufficient for an 'average joe' fast and lightweight AR?
Click to expand...


no.....low mass makes the biggest felt difference when the lighter mass comes to a stop in the forward direction, Low mass with a adjustable gasblock or Key and tune it so it cycles and stays open on empty mag.
 
mikethebike said:
If you want to run sonething fast take a look at my thread on triggers:
http://www.canadiangunnutz.com/forum/showthread.php/1214435-AR-15-trigger-reviews-STICKY-PLEASE

if you want to run something fast AND on target combine it with this stuff in this thread I spent a whole day on:
http://www.canadiangunnutz.com/forum/showthread.php/1213917-5-56-Muzzle-devices
Click to expand...

Wow, great links Mike, thanks for your time and effort. Well deserved stickies :cool:

Sorry for the off topic OP :redface:
 
I don't know squat about this topic, but I'll be happy to give an opinion...If your involved in some form of competition and you find you have reached a peak this MAY be the answer.

So first question you have to ask is am I entering matches. Next have I reached a plateau. If you can answer yes to both then maybe, once again maybe, something like this might be worth the bother.

If it's strictly about weight time to start curling dumbbells instead of cans of soup...
 
mikethebike said:
its F = mass X velocity SQUARED
so if mass is reduced velocity only slightly increases
Click to expand...
This weird guy call "Newton" has a "second law of motion" which says different.
motion_force3_240x180.gif

Acceleration is not the same as velocity squared.
 
You must log in or register to reply here.
Back
Top Bottom