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EMG SAI Licensed Steel Bolt Carrier for M4 Airsoft GBB Rifles by RA-Tech (Model: WE-Tech)

ID: 67792 (Bolt-EMG-SAI-WE)
4.7 stars, based on 3 reviews
EMG SAI Licensed Steel Bolt Carrier for M4 Airsoft GBB Rifles by RA-Tech (Model: WE-Tech)
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Nozzle, nozzle guide, and nozzle retainer shown for reference only and are sold separately
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EMGRA-Tech/Maple Leaf (AST)


MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.
*Nozzle, nozzle guide, and nozzle retainer shown for reference only and are sold separately


  • Licensed by Salient Arms International
  • Made from heat-treated medium carbon steel
  • Titanium Nitride (TiN) coating for superior surface-wear resistance
  • Nice heavyweight feel for more realistic handling and feedback
  • Bolt carrier keyway is held in place by 2x long thread heat-treated screws
  • Steel bolt catch included
  • Direct drop-in performance part, easy to install with minimal to no modification necessary
  • Compatible with OEM nozzle, nozzle guide, and nozzle retainer, and retaining pin (not included)
Compatibility: For WE M4/M16 series Airsoft GBB rifles
Material: Heat-treated, TiN coated medium-carbon steel
Package Includes: TiN Coated Steel Bolt, Steel Bolt Catch

Manufacturer: EMG (OEM: RA-Tech)

About EMG

The EMG vision is to manufacture products the world has never seen before; products we would put our name on, and products that hit the spot! "EMG" (Evike Manufacturing Group) was spawned from the realization that if you want something done exactly the way you want it, you need to do it yourself, and we did just that.
We took our 16 years of knowledge as the market's lead retailer, our network of 300+ superior manufacturers, to work with inspiring top innovators in the firearms industry. That combined with the vision to invest into the Airsoft industry, an industry we believe in, EMG was born.

3 Customer Reviews

(Write a review)

by brian w. on 05/18/2017
"Drop in fit. Beautifuly made, cycles great bangs HARD! Love it. Highly recommend!
by Quan Minh V. on 01/26/2017
"Just got the bolt today. Pretty happy how it looks and feel. Got it to fit in my WE 888c (HK 416c). The thing looks flawless. At first I couldn't charge the handle back, but after a little fiddling, it did the trick. Make sure to lube it thoroughly, especially at the rear end of the bolt.

Only thing I complain is the bolt catch doesn't always engage like it used to anymore, not sure why. The bolt catch might need some trimming perhaps. It's pretty stiff after installing the bolt. You will notice this right after you install the bolt, as you might not even charge the handle back, or close the upper receiver. This happens to both the stock and the included new bolt catch. But like I said, fiddle with it a bit then everything will fall in place.

Also a minor aesthetic detail is the laser etched SAI logo has a little burnt outline around it, not as crisp as in the photos. But it's barely visible. Still looks neat regardless.
by Nicholas C. on 04/21/2018
"Drop in part with no modifications required. Accepts standard loading nozzles. It has an excellent build quality, hasn't deformed or been marred at all after thousand's of shots. The only problems are that it is heavier than a standard BCG for a WE M4, because it is actually steel, and therefore slows the cycling slightly and makes the gun overall a little less gas efficient. And while the finish is of a great quality, it looks fantastic and is really durable, i think it's a little coarser than the standard bolt which i think is also (though not much at all) slowing down the cyclic rate. So while this is a great looking and still functional part, I'd recommend at the very least, using CO2 mags for this, to ensure 100% reliability.

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