CYMA CM.621 M4 KeyMod Airsoft Rifle

CYMA
Code: …
£159.99
  • MOSFET Inside
  • Microswitch Trigger
  • Quick Change Spring

Featuring a Microswitch Trigger, MOSFET and Quick Change Spring system with a tough Nylon Fibre exterior, the CYMA CM.621 is possibly one of the greatest out-of-the-box guns on the market for the money.

Full description

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Size guide

Description

The CYMA CM.621 M4 KeyMod AEG is an M4 based design which offers a lightweight and tough KeyMod Rail System with 20mm RIS adaptors included for your choice of attachment type. It has a world of features out of the box which would be unheard of in most competing models in the same price range, and offers excellent value for money. With a MOSFET, Quick Change Spring, and reinforced Polymer externals, this AEG is the perfect starter gun.

The front of the AEG has a 14mm CCW Thread underneath the Bird Cage Flash Hider which will allow you to install Supressors, Tracer Units, Muzzle Brakes and more. Simply unscrew the grub screw from the Flash Hider and twist to remove. The Handguard is a KeyMod Rail System which comes included with side and lower 20mm adaptors, to give you flexibility in the type of attachments you can use. The Top 20mm Rail runs the full length of the Handguard and down to the back of the Receiver, which is ready for Sights and Scopes to attach, and is also where you will find a set of Flip Up Ironsights which can be removed if you don't want them. At the rear of the Receiver you will notice an Ambidextrous Sling Plate, which means that you can attach a Sling from either side of the Gun, depending on whether you're Left or Right Handed. The stock is a Sliding Crane Stock design and houses your Battery, connected to a Deans Connector. To access the Stock, simply squeeze the tabs on the Butt Plate and pull it away as well as the blanking plate underneath. We recommend either a 9.6v 1600mAH NiMH Crane Battery or 7.4v <2000mAH Crane LiPO Battery for the best fit.

Deep inside the CYMA CM.621 there is a MOSFET to protect the Electrical Components of the AEG, as well as a Microswitch Trigger which is very pleasant to use. The benefit of a Microswitch Trigger is much faster response from the gun, as well as removing the chance of burnt-out Trigger Contacts from a traditional design. The gun has a Quick Change Spring system which lets you change the Main Spring in seconds, once the Gearbox has been removed from the Receiver. This is an amazing feature for Airsofters who play at lots of different sites with varying Power Limit rules, and need to quickly change the FPS of their gun. Please note that technical skills are still required to remove the Gearbox from the gun. The gun has an Adjustable HOP Unit which will apply backspin to your BBs, and potentially increase effective range when combined with a Heavyweight BB (0.25g+) and the correct settings on the Adjustment Wheel. To make changes to the HOP, pull back the charging handle and look inside the dust cover to access the Adjustment Wheel.

Included in the box is an Alloy 300rnd High Cap magazine which is filled from the top via the fill window and wound from the bottom with the clockwork wheel to feed BBs. If you're looking for the ideal starter gun to get you on your way to Airsoft skirmishing, and/or are looking for fantastic value out of the box, then the CYMA CM.621 is just that.

Features

  • Microswitch Trigger
  • MOSFET Installed
  • Quick Change Spring
  • Tough Nylon Fibre Polymer
  • Full Metal Gearbox
  • Alloy Outer Barrel Assembly
  • Alloy Buffer Tube
  • Rear Wired / Deans
  • 14mm CCW Thread
  • 300rnd High Cap Magazine
  • Flip-Up Ironsights
  • Perfect Starter Gun
  • Excellent Value for Money
  • Sliding Crane Stock
  • Fast Trigger Response
  • KeyMod Railed Handguard
  • 20mm Receiver Rail
  • Ambidextrous Sling Plate
  • Adjustable HOP
  • Gear Style HOP Adjust

Package Includes

  • CYMA CM.621 M4 KeyMod Airsoft Rifle
  • 300rnd High Capacity Magazine

Specification

General

Weapon Construction External
 Weapon Type
Assault Rifle
Over 18 Only Icon
 Over 18
Yes
Icon UKARA - United Kingdom Airsoft Retailer Association
 Defence / UKARA Required
Yes, No,
FPS Icon
 FPS (Feet Per Second), using 0.20g BB
Approx. 315fps ± 10%, using 0.20g BB
Site Legal Icon
 Site Legal, using 0.20g BB
Yes
Package
 Included Items
Magazine
Skill Level Icon
 User Skill Level
Starter

Weight and Dimension

Weight KG Icon
 Weight (KG)
Approx. 2kg
Weapon Length Collapsed
 Length (Collapsed)
74cm
Weapon Length Extended
 Length (Extended)
82cm

Construction

Colour Wheel Greyscale
 Primary Colour
Black
Two Tone Icon
 Pre Two-Toned
No
Construction Icon
 Construction
Alloy outer barrel assembly, magazine, buffer tube and trim. Polymer handguard, receiver, pistol grip and stock.
Weapon Construction External
 External Construction
Polymer
Alloy
Gearbox Icon
 Internal Construction
Polymer
Alloy

Weapon Specific

Power Source Icon
 Powered By
Electric
Blowback Icon
 Blowback
None
Weapon Platform
AR, M4 / AR-15 / M16,
Magazine Style Icon
 Magazine Style
STANAG, M4 / AR Platform,
Fire Select Icon
 Fire Selector
PatrolBase | Fire Select Safe
 Safe
Patrol Base | Fire Select - Semi Automatic
 Semi Automatic
Patrol Base | Full Automatic
 Full Automatic
Weapon Safety Features Icon
 Safety Features
Trigger Lock
Shooter Configuration Icon
 Shooter Configuration
Right Handed
Weapon Configuration Icon
 Weapon Configuration
Standard
Weapon Scale Icon
 Weapon Scale
1:1
Suggested BB Weight
0.25g

Hop-Up

Hop-Up Unit Icon
 Hop-Up Unit
Yes
Hop-Up Unit Adjuster Icon
 Hop-Up Adjuster
Gear
Hop-Up Unit Location Icon
 Hop-Up Location
Behind mock bolt when charging handle pulled to the rear

Furniture

Weapon Furniture Icon
 Furniture
  • Railed Handguard
  • Flip-Up Ironsights
  • Railed Receiver
  • Sliding Stock
  • Threaded Outer Barrel
  • Ambidextrous Sling Plate
Rail System Icon
 Rail System
20mm RIS / RAS , KeyMod ,
Icon Stock Positions
 Stock Setting
Sliding
Weapon Length Extended
 Stock Positions
6 Position
Sight Type Icon
 Sight Type
Iron Sights
Sling Plate Icon
 Sling Options
Buffer Plate

Barrel

Icon Thread Type
 Outer Barrel Thread Type
Male
Icon Thread Direction
 Outer Barrel Thread Direction
CCW (Counter Clockwise)
Outer Barrel Thread Size
14mm

Magazine Specific

Magazine Type
High Capacity, AEG,
Magazine BB Capacity
Approx. 300 Rounds
Magazine BB Fill Method
Fill Window
Magazine BB Fill Location
Top

Electric Gun Specific Information

Gearbox
Gearbox Icon
 Gearbox Version
V2 Gearbox
Wiring Icon
 Gearbox Wiring
Rear Wired
Spring Change Icon
 Gearbox Quick Change Spring
Yes
Digital Trigger Icon
 Gearbox Electronic Trigger
Yes
Battery Specific
Battery Connector
Patrol Base | Icon | Deans
 Deans
Compatible Battery
Compatible Battery Type
Ni-Mh
Compatible Battery Configuration
Crane
Compatible Battery Voltage
9.6v

Product Testing Data

Notepad Icon
 Test Description
315FPS
Notepad Icon
 Tested Using
ASG Blaster 0.20g BBs
Notepad Icon
 Test Date
27/09/19

Detailed Power Tests

FPS
FPS, using 0.20g BB
Approx. 315fps, using 0.20g BB

Size guide

Joule Charts

Special Instructions

These table can be used as a reference to see if the BB weight you are using will be over acceptable Joulage limits at some Airsoft Sites in the UK. To check if the weight can be used chrono your weapon using the BB you intend to use, and then compare it to the chart.

FPS, Power and Joule Limits can vary from site to site, so please get in touch with where you're going to play with in advance to avoid disappointment.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, with a 350fps limit for Automatic Replicas, 400fps for Semi-Automatic Replicas, and 500fps for Bolt Action Replicas.

Tap the tabs below to open the relevant chart for your replica.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, and is the equivalent of 350fps, using 0.20g BB resulting in an upper limit of 1.14j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
325 0.98 1.23 1.37 1.47 1.57 1.77 1.96 2.11 2.21 2.45
328 1.00 1.25 1.40 1.50 1.60 1.80 2.00 2.15 2.25 2.50
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
335 1.04 1.30 1.46 1.56 1.67 1.88 2.09 2.24 2.35 2.61
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
345 1.11 1.38 1.55 1.66 1.77 1.99 2.21 2.38 2.49 2.76
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
355 1.17 1.46 1.64 1.76 1.87 2.11 2.34 2.52 2.63 2.93
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 400fps, using 0.20g BB resulting in an upper limit of 1.49j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 500fps, using 0.20g BB resulting in an upper limit of 2.32j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90
420 1.64 2.05 2.29 2.46 2.62 2.95 3.28 3.52 3.69 4.10
430 1.72 2.15 2.40 2.58 2.75 3.09 3.44 3.69 3.86 4.29
440 1.80 2.25 2.52 2.70 2.88 3.24 3.60 3.87 4.05 4.50
450 1.88 2.35 2.63 2.82 3.01 3.39 3.76 4.04 4.23 4.70
460 1.97 2.46 2.75 2.95 3.15 3.54 3.93 4.23 4.42 4.91
470 2.05 2.57 2.87 3.08 3.28 3.69 4.10 4.41 4.62 5.13
480 2.14 2.68 3.00 3.21 3.42 3.85 4.28 4.60 4.82 5.35
490 2.23 2.79 3.12 3.35 3.57 4.02 4.46 4.80 5.02 5.58
500 2.32 2.90 3.25 3.48 3.72 4.18 4.65 4.99 5.23 5.81
510 2.42 3.02 3.38 3.62 3.87 4.35 4.83 5.20 5.44 6.04