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Black Ops Defense LLC

Gun shopGunsmith

Profile updated October 28, 2026

What they offer

Gun shop

Sales
Online

Gunsmith

Work
Refinishing
Platforms
HK 416C/MR556

Prices

As published by the business.

  • NFA/SBR Engraving - Receiver Bottom $49 per receiver · Laser engraving for Form 1 tax stamp.
  • MR Barrel Extension Tab/Stopper Removal $49 per barrel
  • Pin/Weld Extended Muzzle Device $99 per barrel · Starting at $99; extended barrel using supplied muzzle device, usually for 16" OAL builds.
  • A5/MR223 Barrel Extension Machining $129 per barrel or upper · Starting at $129; machine barrel to fit upper or machine upper to fit barrel.
  • Full Auto Upper Relief Cut Machining $129 per upper receiver · Makes semi-auto upper compatible with post sample and transferable machinegun lowers.
  • Low Shelf Trigger Pocket Machining $129 per lower receiver · Does NOT make firearm full auto; all NFA rules apply.
  • M27 Bayonet Lug Installation (Heavy Profile) $129 per barrel · Starting at $129; light profile (new style) $229.
  • Ambidextrous Bolt Catch Receiver Cut Service $149 per receiver · Machining for ambidextrous A5/A7/MR223 HK bolt catch/release; service only.
  • Barrel Chrome Lining $149 per barrel · Chrome lining and refinishing of bore, chamber and extension.
  • Buffer Tube & Charging Handle Refinishing (both) $149 per set · Starting at $75; charging handle only $99; buffer tube only from $75.
  • Gas Block Modification $149 per gas block · Welding, redrilling and refinishing of factory rifle gas block for short barrel configuration.
  • 416 Barrel Work Modification (416D 10.5in / A5 11in / A7 14.5in) $199 per barrel · Starting at $199; 1/2 x 28 in. thread standard; includes full-auto bolt stop removal and gas port resizing.
  • Basic Disassembly And Reassembly $199 per firearm · Required unless sending stripped parts.
  • CeraKote Upgrade (final finish) $199 per finish · Upgrade from DuraCoat on work order pages.
  • FN SCAR 16S/17S MK 16 CQC SBR package $199 per barrel · Shortening barrel to 10" (or other lengths), threading and gas port modification.
  • Safety Selector/Bullet Markings $199 per receiver · Starting at $199; full-auto 3 position or semi-auto 2 position markings.
  • Upper Receiver Paint/Color Matching (spray-on finish) $199
  • Work Order 416 Conversion Services Spray-On Finish $299 per work order · Strip, refinish/Duracoat and laser mark MR556 receiver or receiver set; services only, no parts included.
  • 90 Series Barrel Swap (9mm / 5.56 / 7.62x51) $349 per barrel · Starting at $349; 40Cal/10mm $499; no parts included.
  • 416 Barrel Work Modification (416C 9in) $399 per barrel
  • Upper Receiver Anodizing/Color Matching $399
  • Work Order Basic Refinishing (MP5/90 series) $399 per work order · MP5 (and other 90 series) basic work and refinishing.
  • MLI RAL8000 Color Treatment: MP5 $499 per treatment · All necessary parts coated in RAL8000 tan; includes replacement MLI tan lower housing.
  • Work Order 416 Conversion Services (anodizing) $499 per work order · Strip, re-anodize and laser mark MR556 receiver or receiver set; services only, no parts included.
  • Work Order MP5 Standard 9mm Custom Build Service $1,499 per work order · MP5 standard 9mm build services; no parts included.

Sources and corrections

Sources: blackopsdefense.com.

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