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Home » Airsoft Accessories, Attachments & Parts » AEG Internal Parts » Hop-Up » M4 / M16 Series Hop-Up

CYMA Tracer Hop-Up Unit for CYMA Platinum M4 Series Airsoft AEGs w/ MOSFET

ID: 106474 (HU-CYMA-M251)
M251 (PENDING REVISION)
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CYMA

$39.99

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.

Description

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Product Description

Features

  • Durable alumiunm alloy construction
  • Tracer built-in to the hop-up elimitating the need for a barrel attachment tracer device
  • Adjustable and provides excellent accuracy
  • Works with green tracer BBs
  • All required hardware included

Manufacturer: CYMA

Disclaimer: Professional installation highly recommended. Please use discretion when installing custom parts as fit and compatibility may vary. Modification may be required. Professional installation recommended.

3 Customer Reviews

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by josh n. on 01/29/2026
"CYMA quality product ? YES ! Mine is a little different from what is pictured. Only because now some gray colored electrical silicone glue has been used on the LED board helping to prevent vibration breaking the small electronics. I’ve worried about this issue so I just used some electrical potting silicone and encased the entire board and all the electronics on it. And this is a very very bright UV LED that will make green and red tracers glow brighter than any barrel end tracer units will ever. It’s so bright that the purple light comes out from the barrel end like a flash light almost. Nice quality decent piece of aluminum hop up unit that is cast well. Comes with the perfect amount of wire that took a little while to get it wired so take your time. Has the 3s balance charger port connector already installed so you can use your guns battery or have a micro 2nd 3s battery just for the hop up.
by Matthew M. on 05/19/2024
"Works great with red tracers, Not a bad hopup housing, has on/off switch that is accessible from the hopup window, operates perfectly with a 7.4v 350mah. Works in both semi and full auto.
by Robert H. on 02/16/2026
"All in all not bad, works great with the tracers however The holes for the LED lights caused feeding issues, however, once plugged worked perfectly fine.

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CYMA

About CYMA

CYMA Airsoft was established in 2000 with a mission to create the finest Airsoft gun & training weapons for law enforcement, military training, Survival game & Military simulations.

We are not just a OEM manufacturer, but an innovative expert in Airsoft and training weapons. When everyone still concentrates in following the old Airsoft trend, we have already developed our breakthrough GBB System for Airsoft Rifle & SMG. We're experienced in working with Real Steel Firearms companies, helping them to make training weapon for their law enforcement, Military customers.

In addition to firearms training clients, we also take our Airsoft customers seriously, we do our best to make every Airsoft gun perfect, we just want the owners of CYMA Airsoft products feeling proud, and to conquer the survival game field.