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

320B (*)

Schematic Image

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

Image Part Key Product # Description Price Add To Cart
S10 41430A Base Screw $2.45 Sold Out
Bead & Aperture
S19 41560A Bead & Aperture $5.20 Buy Now
Bead & Aperture Screw
S20 41570A Bead & Aperture Screw $2.45 Buy Now
S15 41490A Click Spring $2.45 Sold Out
S21 296190A Dovetail Base $4.40 Sold Out
Elevation Lock Screw
S11 41450B Elevation Lock Screw $2.45 Buy Now
Elevation Nut
S8 87280A Elevation Nut $2.45 Buy Now
Elevation Screw
S16 41510B Elevation Screw $4.40 Buy Now
Elevation Spring
S7 41410B Elevation Spring $2.45 Buy Now
Front Sight Base Screw
S23 41620D Front Sight Base Screw $2.45 Buy Now
S18 41550A Hood $4.85 Sold Out
Indicator Plate
S13 41470B Indicator Plate $2.45 Buy Now
S12 41460A Indicator Plate Screw $2.45 Sold Out
Mossberg 320B, 320BA, 320K, 320KA, 320TR, 321B, 321K Schematic W/ Parts List
PDF0284 Mossberg 320B, 320BA, 320K, 320KA, 320TR, 321B, 321K Schematic W/ Parts List $1.50 Buy Now
Peep Disc
S1 533210B Peep Disc $5.45 Buy Now
Ramp Base
S22 41610A Ramp Base $8.80 Buy Now
S9 41420A Receiver Sight Base $14.95 Sold Out
Sight Click Ball, #BB-3 (2 Req'd)
S14 41480A Sight Click Ball, #BB-3 (2 Req'd) $2.95 Buy Now
S17 41530A Windage & Elevation Bracket $10.15 Sold Out
Windage Clip
S5 41390A Windage Clip $2.45 Buy Now