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G&P Negative Pressure System Complete Bolt Carrier Group Set for G&P and Western Arms Gas Blowback Rifles (Version: Gold Chromic Salient Arms Bolt)

ID: 72333 (Part-GP-WP206B)
G&P Negative Pressure System Complete Bolt Carrier Group Set for G&P and Western Arms Gas Blowback Rifles (Version: Gold Chromic Salient Arms Bolt)
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EMGSAI - Salient Arms Intl


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  • Designed to provide consistent gas flow regardless of the amount of contact between the loading nozzle and BB
  • Precision machined aluminum alloy bolt carrier
  • Parkerized style finish provides protection against wear and tear and adverse weather condtions
  • Designed to dramatically improve gas efficiency
  • More consistent gas use provides the user with a more consistent, higher FPS
In a vast improvement over the original Western Arms gas system, G&P developed the Negative Pressure Bolt carrier group for the G&P/Western Arms M4 series of GBBRs. Whereas the original WA system requires contact with the BB to open the valve plunger, the G&P negative pressure bolt provides a steady output of gas, regardless of the contact between the nozzle and the BB. Like all G&P gas blowback bolts, the G&P negative pressure bolts are machined from light and ruggedly durable aluminum alloy with a wide variety of finishes

Compatibility: G&P and Western Arms M4/M16 gas blowback rifles with a CNC machined receiver
Material: Aluminum alloy, polymer

Manufacturer: G&P

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.

About SAI - Salient Arms Intl

Salient Arms International (SAI) is dedicated to providing elite weaponry to customers who expect only the very best in both accuracy and performance. Whether they are military, law enforcement, civilian, or competition shooter, we will provide them with cutting edge products that they can rely on.SAI prides itself on applying an out-of-the-box approach to industry problem-solving. We identify and address a weapon's shortcomings and then strive to create an improved and completely unique platform. Our approach to aesthetic design follows a very similar course. SAI places performance at the forefront of all its designs and that emphasis on performance creates a truly remarkable and striking firearm for the end user.We at SAI believe that a weapon designed around performance instills confidence in its user. That confidence can mean the difference between success or failure, winning or losing, and even life or death.

2 Customer Reviews

(Write a review)

by William P. on 04/10/2023
"Threw this into my DDM4 GBBR and its now running at 450fps w/ .25g bbs with the high pressure nozzle tip. Comes with 3 velocity tip settings for lower power as well. Runs smooth as butter with the roller bolt on the back end, gas efficiency is greatly improved and my shots are far more consistent. Perfect for DMR on the highest setting if your local field allows it.
by Branden Y. on 06/06/2018
"Looks to be the same part in the SAI GRY GBB rifle.
One thing to note is that the item requires some assembly. You basically get one bolt carrier, with two duplicates of the plastic bits that make up the nozzle/valve to form the whole bolt carrier group.

This may be a con for some but it worked out for me since I was planning on installing an adjustable NPAS valve so I could easily swap the BCG for both indoor and outdoor play.

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