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

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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

400 MKII (*)

Schematic Image

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

Image Part Key Product # Description Price Add To Cart
image not available
52 510320 Rear Sight Blade $6.45 Sold Out
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NI 510310 Rear Sight Assembly, New Style $25.25 Sold Out
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NI 921700 Rear Sight Assembly, Old Style $25.25 Sold Out
Rear Sight Base Spring
NI 510340 Rear Sight Base Spring $2.35 Buy Now
Rear Sight, Old Style, Blued
NI 921710 Rear Sight, Old Style, Blued $13.10 Buy Now
Rear Sight, Old Style, Stainless
NI 921720 Rear Sight, Old Style, Stainless $13.10 Buy Now
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NI 503150 Safety Detent $4.00 Sold Out
Sight Ball, Old Style
NI 503610 Sight Ball, Old Style $2.35 Buy Now
Sight Elevator Spring
NI 921820 Sight Elevator Spring $2.35 Buy Now
Sight Pivot Pin
NI 510260 Sight Pivot Pin $2.35 Buy Now
Sight Screw, Old Style
NI 510240 Sight Screw, Old Style $2.55 Buy Now