If you already own 20V MAX batteries and want the lower-priced bare 6-1/2-inch saw for lumber and sheet goods, get the DCS391B circular saw (tool only); if you are on the M18 system and want a brushless saw with a work light and rafter hook for jobsite days, get the 2730-20 M18 FUEL circular saw (tool only). The DCS391B pairs a brushed motor stated at 5,150 rpm with a 6-1/2-inch carbide-tipped blade, a 0-to-50-degree bevel range and a magnesium shoe, and it ships as a bare tool with no battery or charger. The 2730-20 pairs a POWERSTATE brushless motor with REDLINK PLUS electronics, the same 6-1/2-inch blade size and 0-to-50-degree bevel range, a cast magnesium shoe and guards, plus an integrated LED light and a rafter hook, also as a bare tool. On 09/12/2026 the exact DCS391B Amazon listing showed a Buy New block with Add to Cart and Buy Now shipping from Amazon.com and sold by Amazon.com, and its This-item module listed $159.00 and In Stock with delivery as soon as Thursday, Sep 17; the main buybox price sits behind an add-to-cart step, so confirm the live price before deciding. The exact 2730-20 Amazon listing showed an add-to-cart block shipping from and sold by ToolMasters Associates, and its This-item module listed $229.00 with delivery as soon as Friday, Sep 18, sold by ToolsUsa with shipping from Amazon Fulfillment; no exact-variant In Stock line appeared in the observed text, so check the current price and seller at checkout.
Choose by your situation
| Situation | Model to consider | Main tradeoff |
|---|---|---|
| You own 20V MAX batteries, cut framing lumber and plywood, and want the cheapest observed entry into a 6-1/2-inch cordless saw with Amazon-direct fulfillment | DCS391B | Brushed motor rather than brushless, and at 7.58 lbs stated weight it is the heavier saw in this pair. |
| You own M18 batteries, work on jobsites, and want a brushless saw with a built-in light, rafter hook and electronic overload protection | 2730-20 | The observed price is $70 above the DeWalt This-item line, and the exact-variant buybox is served by marketplace sellers rather than Amazon directly. |
Two bare 6-1/2-inch saws, side by side
| Criterion | DCS391B | 2730-20 |
|---|---|---|
| Voltage platform and scope | 20V MAX system; bare tool, 0 batteries included and no charger, per the maker page | M18 18-volt system; bare tool with the battery not included, per the maker page |
| Motor and stated speed | Brushed motor; maker states 5,150 rpm maximum | POWERSTATE brushless motor with REDLINK PLUS protection, per the maker; the Amazon listing block states 5,000 rpm no-load |
| Blade and arbor | 6-1/2-inch carbide-tipped blade included, per the maker | 6-1/2-inch blade with 5/8-inch arbor; blade and blade wrench included, per the maker and listing block |
| Bevel range | 0 to 50 degrees, per the maker | 0 to 50 degrees, per the Amazon listing block |
| Depth of cut stated on the Amazon pages | 2-1/8 inches at 90 degrees and 1-5/8 inches at 45 degrees | 2-3/16 inches at 90 degrees and 1-5/8 inches at 45 degrees |
| Shoe and guards | High-strength lightweight magnesium shoe, per the maker | Cast magnesium guards and shoe, per the maker |
| Size and weight stated | 13.78 inches long and 7.58 lbs, per the maker | 16 inches long and 6.3 lbs, per the Amazon listing block |
| Handling and jobsite extras | Rubber overmolded comfort grip, keyless blade change and spindle lock, per the Amazon page | Integrated LED light and rafter hook, per the maker |
| Warranty stated | 3-year limited warranty with 1-year free service and 90-day satisfaction, per the maker | 5-year tool warranty statement in the Amazon listing block; confirm current terms on the maker page before purchase |
| Observed Amazon standing | 4.6 out of 5 stars across 11,166 ratings with 300+ bought in the past week at observation | 4.5 out of 5 stars across 1,064 ratings, Amazon's Choice, with 200+ viewed in the past week at observation |
DCS391B: the lower-priced 20V MAX bare saw
The DCS391B 20V MAX 6-1/2-inch circular saw suits buyers already holding 20V MAX batteries who want a straightforward saw for rip cuts, crosscuts and bevel cuts in lumber and sheet goods. The maker-specified combination is a brushed 5,150-rpm motor, a 0-to-50-degree bevel, a magnesium shoe for cut accuracy, and a 6-1/2-inch carbide-tipped blade in the box with no battery or charger. Its limits are mechanical and plainly stated: a brushed motor instead of brushless, a 7.58-lb stated weight that trails the Milwaukee figure, and a slightly shallower stated 90-degree cut (2-1/8 versus 2-3/16 inches). The Amazon US listing carried a 4.6-out-of-5-star rating across 11,166 ratings with 300+ bought in the past week at observation.
2730-20: the brushless M18 alternative with jobsite extras
The 2730-20 M18 FUEL 6-1/2-inch circular saw suits M18 battery owners who want brushless efficiency plus small features that matter on site: an integrated LED light over the cut line, a rafter hook for pausing between cuts, REDLINK PLUS overload protection, and magnesium guards and shoe. The maker confirms the 2730-20 as an M18 FUEL brushless tool supplied with a blade and wrench but no battery; the Amazon listing block adds 5,000 rpm no-load, a 0-to-50-degree bevel, and a 16-inch, 6.3-lb body. Its limits are commercial on the observed day: the exact-variant buybox shipped from and was sold by ToolMasters Associates, the This-item line showed $229.00 through ToolsUsa with Amazon Fulfillment shipping, and no exact-variant In Stock line appeared, so the final cost and seller need a live check. The Amazon US listing carried a 4.5-out-of-5-star rating across 1,064 ratings with Amazon's Choice at observation.
Where to check the exact variants
Compare the DCS391B bare saw with 6-1/2-inch blade (Amazon listing with Add to Cart and Buy Now, shipping from Amazon.com and sold by Amazon.com; This-item line observed In Stock at $159.00 on 09/12/2026) against the 2730-20 bare saw with blade and wrench (Amazon listing with Add to Cart and Buy Now, shipping from and sold by ToolMasters Associates; This-item line observed at $229.00 through ToolsUsa with Amazon Fulfillment shipping on 09/12/2026). Either covers 6-1/2-inch cordless cutting for its battery system; the DCS391B covers the lower observed price with direct Amazon fulfillment, the 2730-20 covers brushless drive with a light, hook and protection electronics.