Buds sell it but they listed it as a New England firearms (same company) here are the specs notice the upc UPC:
010633051287
Description:
H&R PARDNER PUMP 12M/28M SYN
Brand:
Harrington & Richardson
Model:
Pardner Pump
Type:
Shotgun: Pump Action
Caliber:
12 Gauge
Finish:
Blue
Action:
Pump Action
Stock:
Black Synthetic, Checkered Stock
Sight:
Bead
Barrel Length:
28
Overall Length:
48.125
Weight:
7.5 lbs
Capacity:
5+1, 3 Shot Plug Furnished
Safety:
Cross-bolt Safety
Receiver:
Blue, Drilled & Tapped
Chamber:
3
Chokes:
Screw In Modified
Butt Plate:
Black Vented Recoil Pad
Features:
Vent Rib;
Length of Pull 14.25 and Buds listing with same UPC budsgunshop.com/catalog/product_info.php/products_id/14108/new_england_np1-2s8_pump_12ga_28_ctmd_syn

Anthony, yes you can Sir. It actually comes with the 28" Barrel from H&R. You can contact H&R for the 28"Barrel only at Phone: (866) 776-9292 ----- google.com/search?q=h%26r+pardner+pump+28+inch+barrel&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi8rMyv5v_fAhUsn-AKHZBFBtIQ_AUIDygC&biw=1280&bih=618#imgrc=ekZFLtpmZJGAnM: