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My take on GBBR
Pros:
-Maximize Firearm parts compatability (though you have to be conscious about some parts, they will fit but do you really want to stick a AR-15 hammer spring in it? etc)
-Realism, No bb fall out when you pull mag out (greatly favor tactical reload as opposed to full reload) Operation is much more like a firearm
-Prevent the airsoft slipping into paintball style of high cap spray n pray, and stockless shooting (in full auto good luck getting a good grouping over 75 feet without shouldering the stock)
-Less parts, less problems, easier to fix (If you're familiar with firearm internals, it takes very little time to transition to GBBR)
-Higher velocity stock, this helps with import for Canadians a lot and keeps the prices down.
CONS:
-Leaky gas magazine, this gives people really big headache, particularly WA and WE system. KJ, KSC had to least reported issue with this
-Expensive magazine, price adds up quickly, 6 magazine loadout you're looking at $300 already. Gone are the days of fielding 10+ magazine, it's expensive
-Material matters, pot metals will wear out quickly, see WA bolt carriers and charging handle, WE firing pin. Soft steel will also give up fast RA-Tech bolt carrier is the one I could think of.
-Temperature sensitive, currently the lowest temperature a GBBR can work is around 5 degrees (30 rounds in one fill) GBBR like 20 degree+. Above 35+ you're going to run into fps problem (Personally saw a guy's GBBR chrono 650fps on 0.4g aka 12.2 firearms)
-Velocity, you ultimately need to have an fps adjuster to avoid shooting 450fps+ gun.
Here's couple of companies
Magna: Notorious for being most expensive
WE: Used to be poor quality, WE has step up alot since then
KJ: Considered to be the only good out of the box reliable ready GBBR
VFC: less magazine leak issue, poor material causing Bolt carrier and charging handle to fail
KSC: Currently too new to tell, based on their record, it can't be worse than VFC or Magna system.
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