Please be aware that due to high order volume our order processing time is approximately 5 business days.

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
1 72150 Slide $114.15 Sold Out
2 188720 Extractor, .22 LR, New Style $38.45 Sold Out
2 188690 Extractor, .22 LR, Old Style $38.45 Sold Out
2 314990 Extractor, .25, .32, .380 Cal., New Style $39.95 Buy Now
2 315000 Extractor, .25, .32, .380 Cal., Old Style $39.95 Buy Now
3 74450 Set Bolt (2 Req'd) $3.40 Sold Out
4 74510 Compression Spring $2.35 Sold Out
5 188760 Rear Sight $13.55 Buy Now
6 74590 Safety $48.95 Buy Now
7 188740 Recoil Spring, .22 LR $12.65 Sold Out
7 74640 Recoil Spring, .25 Cal. $12.65 Sold Out
7 188730 Recoil Spring, .32 Cal. $12.65 Sold Out
7 188750 Recoil Spring, .380 Cal. $12.65 Sold Out
8 799640 Barrel, .22 LR, New Style $94.00 Sold Out
8 188800 Barrel, .22 LR, Old Style $94.00 Sold Out
8 188780 Barrel, .25 Cal. $94.00 Sold Out
8 188770 Barrel, .32 Cal. $94.00 Sold Out
8 188790 Barrel, .380 Cal. $94.00 Sold Out
9 74730 Cylinder Head Screw $5.30 Buy Now