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Heckler & Koch MR556-A1 Complete Upper Receiver Kit 235975-A5

Heckler & Koch MR556-A1 Complete Upper Receiver Kit 5.56mm/.223 Remington With 16.5 Inch Barrel
Heckler & Koch MR556-A1 Complete Upper Receiver Kit 5.56mm/.223 Remington With 16.5 Inch Barrel
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Heckler & Koch MR556-A1 Complete Upper Receiver Kit 5.56mm/.223 Remington With 16.5 Inch Barrel

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Questions & Answers
Is this compatible with a full auto BCG? I’ve heard this was somehow not compatible with a FA BCG.

the bcg is not m16 cut is just off by a little and you can't install a 416 carrier because the the barrel extension has a tab protruding that will prevent it from closing. so it's semi auto all the way.

by Gerry, Verified Owner, January 21, 2021
See 1 More Answer
is this compatible with my truglo red dot? Expert Answer

If your red dot has a picatinny mount then this will be compatible.

by Nick B., Gear Expert, November 16, 2021
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Everything I expected and more by Chris Goebel, Verified Owner, October 7, 2020
High quality upper kit... obviously. Comes with a buffer and buffer spring, soft case, manual, and m-lok hand guard with QD mounts. I ordered the traditional HK quad rail for this. Shoots very well on an aero lower. I am going to build a BRN4 lower ...
Read More...
1/2 found this helpful
Read 1 Review

Product Discontinued by Manufacturer

Heckler & Koch MR556-A1 Complete Upper Receiver Kit has been discontinued by Heckler & Koch and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

ATTENTION! We currently do not ship this product to AK, CA, HI, IL, NY, WA, P.O. Boxes, and U.S. Territories. Please see our policies for more information.

Product Info for Heckler & Koch MR556-A1 Complete Upper Receiver Kit

Includes MR556A1 upper receiver/barrel assembly with 16.5 inch cold-hammer forged barrel, free floating rail system handguard, complete bolt carrier assembly, HK proprietary buffer, recoil spring and is designed to be fully interchangeable with most high quality AR-style firearms. Designed to function with 5.56x45mm ammunition and also cycles most quality .223 Remington ammunition. NOTE: This kit does not work with fixed stock AR-15 rifles.image

Specifications for Heckler & Koch MR556-A1 Complete Upper Receiver Kit:

Mfg Item Num:  235975-A5
Type:  UPPER_RECEIVERS
Barrel Length:  16.5
AR-15 Parts:  AR-15 Parts
Caliber:  5.56mm/.223
Tactica:  Tactical
Finish:  Black
Caliber-Gauge:  .223 REM.
Master Model Header:  MR556-A1 Upper Receiver Kit

Package Contents:

  • Heckler & Koch MR556-A1 Complete Upper Receiver Kit

Ammunition

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Remington UMC Rifle .223 45 Grain Jacketed Hollow Point Centerfire Rifle Ammunition
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(3)
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PPU Match .223 Remington 75 Grain Hollow Point Boat Tail Brass Cased Rifle Ammo, 20 Rounds, PPM2232
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(10)
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$2.02/Round
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PMC Ammunition X-TAC Light Armor Piercing 5.56x45mm NATO 62 Grain Brass Cased Centerfire Rifle Ammunition
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List: $49.99 (Save 23%)
$38.49
$1.92/Round
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Veteran Ammo Defense 5.56x45mm NATO 62 Grain Full Metal Jacket Centerfire Pistol Ammo, 20 Rounds, HMBX-556-25
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(29)
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Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition
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Super Vel Ammunition .223 Remington 77 grain Open Tip Match Brass Cased Rifle Ammunition
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(10)
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Freedom Munitions .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammunition
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Freedom Munitions .223 Remington 62 Grain Full Metal Jacket Brass Rifle Ammunition
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Winchester FMJ Winchester LC .223 Remington 55 gr Rifle Brass Ammunition
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(15)
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Federal Premium .223 REM 55GR FMJ BOAT-TAIL AMMO 500 ROUND CASE, AE223 Case
Federal Premium .223 REM 55GR FMJ BOAT-TAIL AMMO 500 ROUND CASE, AE223 Case
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Barnes Vor-TxRifle Cartridges, 5.56x45mm NATO, TSX Boat Tail, 62 Grain, 20 - Rounds, *31190
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(10)
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Armscor Precision Inc USA .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammunition, 20 Rounds, FAC223-1N
Armscor Precision Inc USA .223 Remington 55 Grain Full Metal Jacket Brass Rifle Ammunition, 20 Rounds, FAC223-1N
(3)
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$12.49
$0.62/Round
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(7)
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Magtech 5.56X45 M193 55 Grain Full Metal Jacket Brass Cased Rifle Ammo, 50 Rounds, 556A
Magtech 5.56X45 M193 55 Grain Full Metal Jacket Brass Cased Rifle Ammo, 50 Rounds, 556A
(1)
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Ammo Boxes

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Berrys 29682 405 Ammo Box 223 Rem,5.56x45mm NATO 50rd Smoke Lid W/Black Bottom
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Berrys 79462 405 Ammo Box 223 Rem,5.56x45mm NATO 50rd Clear Lid W/Black Bottom
Berrys 79462 405 Ammo Box 223 Rem,5.56x45mm NATO 50rd Clear Lid W/Black Bottom
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Berrys 11664 005 Ammo Box 223 Rem,5.56x45mm NATO 100rd Smoke Lid W/Black Bottom
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Berrys 44661 405 Ammo Box 223 Rem,5.56x45mm NATO 50rd Blue Lid W/Black Bottom
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RCBS Impact Resistant Ammo Box .223 Rem/5.56 NATO 86E0BB5F, RC86910
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BERRYS 30 CAL PLASTIC AMMO CAN, BLACK, 12887
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Berrys 86410 005 Ammo Box 223 Rem,5.56x45mm NATO 100rd Blue Lid W/Black Bottom
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Image of Heckler & Koch MR762 14.7" M-LOK Handguard made-in-usa-flag Heckler & Koch MR762 14.7" M-LOK Handguard (1) List: $257.00 (Save $8.51) $248.49

Heckler & Koch MR556-A1 Complete Upper Receiver Kit Unavailable & Discontinued Models

List of Unorderable Models

  • Heckler & Koch MR556-A1 Complete Upper Receiver Kit, 5.56mm/.223 Remington, w/16.5in Barrel, 81000077 , MPN: 235975-A5 , UPC: 642230259300 , Code: 13-UFH-235975-A5
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