Heckler&Koch MR556A1 - Manual (Page 26)

50 51
1-97 MR556A1 Rifle 235973
1-19 Upper receiver, complete 235989
1-5 Barrel 16,5’’, complete 235990
1 Flash hider 233106
2 Gas block 235691
3 Clamping sleeve (2x) 979245
4 Barrel nut 203580
5 Barrel MR556 16.5’’, assembled 235806
6 Gas piston, complete 205381
7 Rod, complete 203648
8 Upper receiver, assembled 235980
9 Axle for cover 203633
10 Ejection port cover, complete 203626
11 Clamping sleeve (roll pin) 979290
12 Elbow spring 203632
13 Clamping sleeve for forward assist 979313
14 Pressure spring for forward assist 203635
15-19 Forward assist, complete 203599
15 Pressure bolt for forward assist 203637
16 Pressure spring for pressure bolt 203636
17 Locking piece for forward assist 203601
18 Pressure bolt for locking piece 979293
19 Retainer, complete 203600
20-25 Charging handle, complete 235028
20 Clamping sleeve (roll pin) 928077
21 Clamping sleeve (roll pin) for pawl (2x) 236299
22 Charging handle 235232
23 Plate 227678
24 Pressure spring 203640
25 Pawl, complete 235377
26-28 Handguard, complete 236204
26 Handguard 233185
27 Locking screw for handguard 236202
28 Shaped spring 233186
29-47 Bolt group, complete 236268
29-36 Bolt head, complete 235604
29 Ejector 233109
30 Pressure spring 233110
31 Cylindrical pin 203569
32 Bolt head 235605
33 Rubber plug 207779
34 Pressure spring 205407
35 Extractor 233108
36 Clamping sleeve (roll pin) 236320
37 Control bolt 233112
38-45 Bolt head carrier, complete 236266
38 Pressure spring 233132
39 Catch 233705
40 Rivet 233706
41 Clamping sleeve (roll pin) 984198
42 Compression spring 235022
43 Bolt 235238
44 Pin 235239
45 Bolt head carrier 236267
46 Pressure spring 233674
47 Firing pin 233703
48-97 Lower receiver, complete 236210
48 Buffer, complete 203570
49 Recoil spring (action spring) 233166
50-81 Lower receiver, assembled 236209
50 Stop pin for locking pin 233115
51 Pressure spring 233116
52 Locking pin (front takedown/pivot pin),
complete 235941
53 Hammer, complete 235627
54 Axle (2x) 227886
55 Disconnector 227695
56 Pressure spring 233149
57 Sear release rocker 235731
58 Pressure spring 235000
59 Bridge 203593
60 Trigger 235732
61 Bolt catch/release 233129
62 Clamping sleeve (roll pin) for bolt
catch/release 979292
63 Pressure spring for pressure pin 233132
64 Pressure pin 233131
65 Magazine catch 227611
66 Pressure spring 233126
67 Retainer for magazine catch 233127
68 Clamping sleeve (roll pin) for safety
lever (2x) 984199
69 Safety lever (2x) 227870
70 Safety roller 236274
71 Pressure spring for locking pin (buffer
detent) 233121
72 Locking pin for buffer (buffer detent) 233120
73 Clamping sleeve (roll pin) for locking pin 986544
74 Trigger guard, complete 233153
75 Clamping sleeve for trigger guard 979294
76 Stop pin 233135
77 Pressure spring for stop pin 233136
78-79 Pistol grip, complete 234671
78 Pistol grip 234672
79 Cover, complete 234668
80 Cylindrical screw 979355
81 Lower receiver 235977
82 Locking pin (rear takedown pin), compl. 235931
83 Stop pin for locking pin 233115
84 Pressure spring 233116
85 Plate 233164
86 Nut for extension 233165
87 Buttstock extension buffer tube), compl. 236272
88-97 Buttstock concave, complete 236269
88 Buttstock 236271
89 Bolt 227378
90 Pressure spring 234688
91 Release lever 235920
92 Clamping sleeve (roll pin) 968761
93 Pressure spring 212846
94 Insert 235919
95 Threaded pin 967663
96 Hexagonal Allen key 235926
97 Buttstock cap, concave 227616
98 HK steel 30 round magazine 251770S
Every attempt has been made to ensure the accuracy of
this information, however errors or changes may occur.
Item Description Part Number Item Description Part Number
PARTS LIST (FOR EXPLODED DIAGRAM, PAGES 48-49)
SECTION 11 — SPECIFICATIONS
Caliber
5.56 x 45 mm NATO
Operating principle Gas operated, short stroke piston
Bolt system Rotating bolt
Feed mechanism Magazines, 10/20/30 rounds
Mode of fire Semi-automatic
Dimensions
Length, maximum (stock extended) 37.68 in / 957 mm
Length, minimum (stock retracted) 33.90 in / 861 mm
Width 3.07 in / 78 mm
Height 9.45 in / 240 mm
Barrel length 16.5 in /421 mm
Weight
Rifle (with empty magazine, iron sights) 9.04 lb / 4.1 kg
Magazine (empty 30 round magazine) .53 lb / .24 kg
Other
Trigger pull 4.5 - 5.6 lbf / 20 - 25 N ( approximate)
Barrel profile 6 lands & grooves, right twist, 1 in 7 in (178 mm)
Sight radius * 14.60 in / 371 mm
Sights Diopter front and rear or accessory Troy Micro sights
Adjustable buttstock 6 positions, 96 mm of travel
* varies as different sights and optics can be mounted on the HK Free Floating Rail System (Picatinny type, MIL-STD-1913), all specifications and technical
data subject to modification
WARRANTY REGISTRATION
Heckler & Koch warranty registration for new firearms is now on-line. To register your new
MR556A1 go to...http://hk-usa.com/warranty/register.html
If you don’t have access to the internet, call HK Customer Service at 706-568-1906 to
obtain a warranty card.