The Ryobi P321K1 bundles the 18V ONE+ AirStrike 18-gauge brad nailer with a 4.0 Ah battery and charger, giving first-time cordless nailer buyers everything needed out of the box. The AirStrike system eliminates the need for a compressor or hose — drive 5/8–2 in. 18-gauge brads on battery power alone. The 4.0 Ah ONE+ pack delivers approximately 1,900 nails per charge, enough for extended trim or cabinetry sessions. The 45%-slimmer nose versus the prior generation fits into tighter cabinet openings. Two non-marring pads protect finished surfaces. The brushed motor ONE+ platform is compatible with the full 300+ tool Ryobi 18V ecosystem.
What is included in the P321K1 kit?
The P321K1 includes the P321 AirStrike 18-gauge brad nailer, one 18V 4.0 Ah ONE+ battery, an 18V charger, and two non-marring pads. No compressor or additional accessories are required.
How many nails can I drive per charge with the included battery?
The included 4.0 Ah ONE+ battery delivers approximately 1,900 nails per charge under typical trim conditions — well above the 700–900 nails typical of 1.5 Ah and 2.0 Ah packs.
Can I use my existing Ryobi ONE+ batteries with this nailer?
Yes. The P321K1 nailer is compatible with any 18V Ryobi ONE+ battery. Smaller packs will work but will reduce runtime between charges.
Does this kit include a dry-fire lockout?
No. The P321 brushed model does not have a dry-fire lockout. Monitor the magazine to avoid blank firing. If dry-fire lockout is important, consider the brushless P322K kit instead.
What is the difference between the P321K1 and P322K?
The P321K1 uses a brushed motor and is part of the standard ONE+ platform, priced lower. The P322K uses a brushless motor (ONE+ HP), adds dry-fire lockout, drives slightly longer nails (up to 2-1/8 in.), and offers improved performance in denser materials.
# Ryobi ONE+ 18V AirStrike 18-Gauge Brad Nailer Kit (4.0 Ah) **Model:** `P321K1` **Brand:** Ryobi **Category:** Brad Nailer > The Ryobi P321K1 bundles the 18V ONE+ AirStrike 18-gauge brad nailer with a 4.0 Ah battery and charger, giving first-time cordless nailer buyers everything needed out of the box. The AirStrike system eliminates the need for a compressor or hose — drive 5/8–2 in. 18-gauge brads on battery power alone. The 4.0 Ah ONE+ pack delivers approximately 1,900 nails per charge, enough for extended trim or cabinetry sessions. The 45%-slimmer nose versus the prior generation fits into tighter cabinet openings. Two non-marring pads protect finished surfaces. The brushed motor ONE+ platform is compatible with the full 300+ tool Ryobi 18V ecosystem. ## Specifications | Attribute | Value | |---|---| | Voltage (V) | 18 | | Platform | ONE+ | | Motor Type | Brushed | | Gauge | 18 | | Nail Length Range In | 5/8–2 | | Magazine Capacity | 105 | | Dry Fire Lockout | No | | Tool Free Depth Adjust | Yes | | Tool Only | No | | Batteries Included | 1 | | Battery Ah | 4 | | Battery Included | Yes | | Charger Included | Yes | | Warranty | 3-year limited | ## What's Included - (1) P321 18V ONE+ AirStrike 18-Gauge Brad Nailer - (1) 18V 4.0 Ah ONE+ Battery - (1) 18V Charger - (2) Non-Marring Pads Source: https://www.jaspecs.com/ryobi/brad-nailer/p321k1-ryobi-18v-one-plus-airstrike-18ga-brad-nailer-kit/