This Howa Ammo Boost kit (mfr. part no. ATIK5R300) ships with a 5-round detachable box magazine for the Howa 1500 rifle in .300 Winchester Magnum, converting an internal-magazine 1500 to detachable-magazine feed. Confirm the round count with your dealer before ordering, as the distributor’s spec sheet for this part number also references a 10-round configuration.

Key Specifications

• Ships with a 5-round detachable box magazine.
• Chambered for .300 Winchester Magnum.
• Fits the Howa 1500 rifle.
• Sold as a magazine conversion kit, not a standalone magazine.
• Includes the hardware needed for detachable-magazine conversion.
• Functions as a drop-in kit requiring no gunsmithing.
• Weighs approximately 0.51 lb as packaged.
• Confirm the round count with your dealer before ordering — distributor data for this part number is inconsistent.
• Manufactured by Howa.

Frequently Asked Questions

How many rounds does this kit’s magazine hold?

It’s listed as a 5-round configuration; distributor data for this part number is inconsistent, so confirm the round count with your dealer before ordering.

Does this kit include the magazine?

Yes, along with the hardware needed to convert your Howa 1500 to detachable-magazine feed.

Buy the Howa Ammo Boost 300 Win Mag Kit

Shop the Howa lineup or browse our full Rifle Magazines selection to find the right fit for your firearm.