Contact Us (626) 286-0360 Store Locations
Extended Phone Support Hours 7am-7pm PST
Browse by Type or Category
SAVE 25% with coupon code: AIRSOFTCON2018 (Exclude MAP and SALE Items)

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 for CNC Receivers)

ID: 72332 (Part-GP-WP206A)
5.0 stars, based on 1 reviews
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 for CNC Receivers)
Hover or touch above to zoom


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.

No Payments + No Interest if paid in full in 6 months through PayPal Credit. Simply check out using PayPal and select PayPal Credit!


  • 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 have never seen before, products we would put our names on it, and products that hits the spot! "EMG" (Evike Manufacturing Group) is 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 manufactures, we work with top innovators in the firearm industry who inspires, combined with the vision to invest into the Airsoft 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.

California residents click here for Proposition 65 warning

1 Customer Review

(Write a review)

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.

Questions, Answers and Comments

Discuss about 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 for CNC Receivers) with your friends and fellow shoppers!

Comment or answer questions for a chance to win awesome prizes. Details can be found on the Facebook page. Remember to check "Also post on Facebook" when commenting to qualify for the giveaways!

Have an urgent question about this item? We monitor these comments daily, but it may be faster to email us directly or call us at (626) 286-0360. Our resident experts are standing by to answer your questions!