Compact and capable the CMMG Mk4 originally created for optimum performance in subsonic, suppressed and short-barrel applications in supersonic ammo loadings. Features EML handguards, full length M-LOK slots on both sides and the bottom of the handguard as well as M-LOK between the top picatinny rail sections; ZEROED parts including: pistol grip, drop-in trigger, 60/90 degree ambi safety, linear compensator, ambi mag catch, extended mag release button, ambi charging handle, bolt catch and polymer dust cover. Includes 30rd PMAG magazine.
Thank you for choosing Guns N Gear Sports! If you have any questions regarding a recent purchase, or product, please feel free to reach out to our knowledgeable Guest Support Team; chat with a team member 7-days a week from 10am until 9pm.
Info@gngsports.com 208-227-8400 Visa / MasterCard / Discover / American Express Accepted
It is the buyer’s responsibility to ensure that the item being purchased is legal to own in your city / state. Verify with your receiving dealer if you are not 100% sure that it is legal. – Magazines that violate capacity restrictions will not be shipped or substituted.
You must be 18 or older to purchase a rifle or shotgun and 21 or older to purchase a handgun. You are responsible for compliance to your local and state laws. Be aware of restrictions on extended magazines and certain types of AR-15 style rifles. Not for sale where prohibited. Firearms: Blackstone will not sell or transfer a firearm to any of the following states: California, Colorado, Connecticut, Hawaii, Illinois, Maryland, Massachusetts, Michigan, Minnesota, New Jersey, New York, Rhode Island, Washington, Guam, Puerto Rico, Samoa, Virgin Islands. In addition, we do not conduct any international sales. **Last updated 01/01/2023 (subject to change)
Automatic Knives (OTF & OTS): Blackstone will not sell or transfer any automatic knives to any of the following states: California, Colorado, Connecticut, Hawaii, Illinois, Maryland, Minnesota, New Jersey, New York, Rhode Island, Washington, Guam, Puerto Rico, Samoa, Virgin Islands, New Mexico, Pennsylvania, Virginia. **Last updated 01/01/2023 (subject to change)
During checkout you specify a Federal Firearms Licensee (FFL) near you who transfers the firearm to you, after successful background check if needed. FFL can be your local Gun Shop, Gun Range or Pawn Shop willing to perform the transfer.
“Local Store Pick Up” in Idaho Falls. *Sales tax may apply. Guns N Gear Sports 1315 S Utah Ave Idaho Falls, ID 83402
The buyer is responsible for all FFL’s transfer fee/s upon pickup which is generally $25. “Local pickup” at our Idaho Falls location is free of charge. For all FFL transfers, the firearm dealer (that we are sending the item/s to) must send us their valid license (FFL) by emailing (Info@gngsports.com). Guns N Gear is not responsible for any lost items shipped via USPS, FedEx, and UPS.
Ammunition Sales
All ammunition will be shipped FedEx or UPS ground; no air freight allowed. Ammunition and firearms must be shipped separately. Always make sure you order the correct ammunition for your specific firearm.
Federal law requires that you must be at least 18 years old to purchase shotgun and rifle ammunition and 21 years or older to purchase handgun ammo.
Check your state and local laws for any other restrictions before ordering. Ammo Shipping Restrictions: Blackstone does not ship ammo to CA, IL, NY, NJ, MA, DC, CT, or P.O. Boxes
Return Policy & Warranty
We fundamentally believe you will be thrilled with the products you purchase from Guns N Gear. That’s because we go out of our way to ensure we get you the exact products you need from the best brands in the industry. We understand, however, that sometimes a product may not be what you expected it to be. In that unlikely event, we invite you to review the following terms related to returning a product.
If you need to return an item or cancel an order, simply contact our Guest Support Team at 208-227-8400 or by emailing Info@gngsports.com (be sure to include your order #). Feel free to use the live chat function on our website for the fastest support. All inquires received during business hours are answered same day!
*All canceled and returned items are subject to a 10% restocking fee.
Please allow 1-5 business days to credit back to your original form of payment.
Damaged/Used Product: Unless there is a verifiable manufacturer’s defect with the merchandise, no returns will be accepted on damaged or used products. This includes firearm parts that have been previously installed.
GENERAL PARTS & ACCESSORIES Returns Within 30 Days: The original method of payment will be refunded in full. Merchandise must be in new condition with all original packaging, documentation, accompanying accessories, and a receipt.
OPTICS Returns Within 10 days: The original method of payment will be refunded in full. Merchandise must be in new condition with all original packaging, documentation, and a receipt. Non-cash transactions:
Restricted Items
AMMUNITION Due to safety and liability concerns, GNG does not accept any returns on ammunition that have exited the facility. All online ammunition sales are final.
NEW & USED FIREARMS GNG does not accept any returns on firearms. We will assist with all recalls, warranty claims, or manufacturer defects with firearms previously purchased from Blackstone.
KNIVES GNG does not accept any returns on knives. This is to ensure every knife purchase from GNG is 100% factory sharp, blemish free, and warrantied by the manufacturer. We will assist with all recalls, warranty claims, or manufacturer defects with knives previously purchased from Blackstone.
Tax Information
Idaho residents will be charged a 6% sales tax.
Questions / Contact Us
Operating Hours: Monday – Sunday: 10am – 9pm Contact Information: Please contact us with any questions or concerns We respond to inquiries same-day during business hours For fast service please reach out to our Guest Support Team: Info@gngsports.com 208-227-8400
