Find Parts

Find Parts

Search By Item Number Or Keyword
Search Manufacturers By Letter

Still Can't Find It?

If you're unable to locate an item please contact us directly.

Please have the following information ready:

  1. Firearm Manufacturer
  2. Firearm Model and Serial Number
  3. Gauge or Caliber of Firearm
  4. Part Description
  5. Any other pertinent information

Then please call our Sales Department toll free at:

866-NUMRICH
(866-686-7424)

Outside U.S.A.:

845-679-2417

Office Hours:
Monday through Friday
8:00 a.m. to 4:30 p.m. EST

HK4 (*)

Schematic Image

*Part Key 'NI' stands for 'Not Illustrated'.

Image Part Key Product # Description Price Add To Cart
Heckler & Koch HK4 Schematic W/ Parts List
PDF0159 Heckler & Koch HK4 Schematic W/ Parts List $1.50 Buy Now
image not available
1 72150 Slide $114.15 Sold Out
image not available
2 188720 Extractor, .22 LR, New Style $38.45 Sold Out
image not available
2 188690 Extractor, .22 LR, Old Style $38.45 Sold Out
image not available
2 314990 Extractor, .25, .32, .380 Cal., New Style $39.95 Buy Now
image not available
2 315000 Extractor, .25, .32, .380 Cal., Old Style $39.95 Buy Now
image not available
3 74450 Set Bolt (2 Req'd) $3.40 Sold Out
image not available
4 74510 Compression Spring $2.35 Sold Out
image not available
5 188760 Rear Sight $13.55 Buy Now
image not available
6 74590 Safety $48.95 Buy Now
image not available
7 188740 Recoil Spring, .22 LR $12.65 Sold Out
image not available
7 74640 Recoil Spring, .25 Cal. $12.65 Sold Out
image not available
7 188730 Recoil Spring, .32 Cal. $12.65 Sold Out
image not available
7 188750 Recoil Spring, .380 Cal. $12.65 Sold Out
image not available
8 799640 Barrel, .22 LR, New Style $94.00 Sold Out
image not available
8 188800 Barrel, .22 LR, Old Style $94.00 Sold Out
image not available
8 188780 Barrel, .25 Cal. $94.00 Sold Out
image not available
8 188770 Barrel, .32 Cal. $94.00 Sold Out
image not available
8 188790 Barrel, .380 Cal. $94.00 Sold Out
image not available
9 74730 Cylinder Head Screw $5.30 Buy Now