Why we like these:
Chrome, Sand Cuts, Dual Ejectors, and the proprietary Down Vent... what's not to like?
The mad scientists at KAK were drunk one night and decided to try putting the vents on the bottom of the BCG rather than on the side. It turns out that this is a great option for people shooting over-gassed rifles suppressed. We threw one of these in our overgassed suppressed MK18, and it made a noticeable difference with the gas we experienced.
A few notes:
- The dual ejectors are great for redundancy, and this thing absolutely flings brass out of the rifle.
- We decided to carry their K-Spec BCGs in Chrome to keep it simple. It's hard, durable, and cleans easy.
- Sand cuts help clear debris that can lead to jams in a dirty environment.
- We have tested this, and although the gas vents down into your magazine and lower receiver, we noticed no significant difference in how dirty the gun or magazine were after shooting suppressed.
- This is a great option for any gun, but if you are shooting a suppressed rifle with a fine-tuned gas system, you probably won't notice much of a difference. This will make a noticeable difference with overgassed factory uppers however.
Official Description From KAK:
Patent Pending
The K-SPEC BCG combines multiple key features focused on increasing the reliability of your AR15 style firearm no matter if you are running suppressed or unsuppressed, and regardless of conditions. The K-SPEC is a truly plug and play BCG that will accommodate whatever configuration your mission requires.
For those running suppressed, the K-SPEC requires no additional tuning or tweaking of the gas or recoil systems to run reliably. Like all KAK BCGs, the K-SPEC is machined to the M16 full auto profile.
Reduced Peak DB Report
When used in conjunction with a silencer, the gas redirect produces a quieter report
See testing results here- Down Vent vs Side Vent DB reduction testing
Slotted Angled Carrier Rails
For enhanced functionality in adverse and rugged conditions such as sand, mud, dirt, and grime. These rail cuts are designed for debris disbursement, resulting in ultra-high functionality in the toughest conditions, including suppressor fouling and foreign contaminates. Strategically located angle cuts in the rails result in fouling and debris being moved into noncritical areas that are not in contact with the receiver and do not affect the function of the firearm. aka sandcutter
Downward Gas Vents
In an effort to reduce the amount of debris and gas vented towards the shooters face, the two standard gas relief ports have been relocated from the ejection port side of the K-SPEC carrier and placed underneath, in the magazine feed lip channels. Two additional emergency relief ports have also been added to the bottom of the carrier to mitigate structural damage in the event of a case head separation. Testing has shown that venting the gasses through the magazine well has no negative impact on the feeding or function of the magazine nor ammunition, and any added heat is negligible.
Dual ejectors
The K-SPEC dual ejector system uses mil-spec ejectors and springs that require no proprietary parts. Ejector holes are centered on the lugs to avoid any reduction in strength of the bolt. The dual ejector system increases the ejection reliability and adds consistency to the ejection pattern. KAK Industry has been manufacturing dual ejector bolts for the AR10/LR308 platform for over a decade and has used that experience to create a durable and reliable dual ejector system for the AR15 platform.
- Designed to function reliably in the toughest conditions
- Optimized for both Suppressed and Un-suppressed use, All uses – All Conditions
- Dual Ejectors for enhanced reliability
- Angled Carrier Rail Cuts for flawless function in adverse conditions and prolonged suppressed use
- Downward Gas Ports to reduce gas blowback to shooter
- Full Auto Profile
- Permatex added between Gas Key and Carrier Mating Surface
- Carrier- 8620 steel, outside rails, bolt runs, and gas bores ground to .0002 tolerances, Chrome finish
- Bolt- 9310 steel, outside diameters ground to .0002 tolerances, MPI test, Chrome finish
- Firing Pin- 8740 steel, Swiss turned, heat treated, precision ground, chrome plated
- Cam Pin – 4140 steel, Swiss turned, heat treated, Chrome finish
- Extractor- 4140 steel, fully machined, Phosphate coated
- Extractor pin- S7 tool steel, ground, heat treated
- Ejector- S7 tool steel, ground, heat treated
- Gas key – 4130 steel, heat treated, Chrome finish, secured with T25 torx fasteners, torqued to spec, staked with hydraulic staking machine
- 11.5 oz
Machined in house and assembled using only the finest steels and components.
KAK Industry takes pride in producing some of the finest Mil-Spec/ Enhanced AR15 bolt carrier groups available, made 100% in house at our MO facility using Doosan machining centers, Tsugami Swiss turning, and the latest in FANUC robotics combined into an automated cell giving us lights out production capability. In house automated CMM Inspection processes ensure consistent quality.
