Key Specifications
| Spec | Value |
|---|---|
| Voltage | 20V |
| Motor Type | Brushed |
| Speed | 3000 SPM |
| Stroke Length | 1 in. |
| Weight (bare) | 4.8 lbs |
| Street Price | $60-80 |
Pros
- Incredible value under $80 -- at $60-80 bare, the CMCS300B is the lowest-cost entry into cordless reciprocating saws that can actually handle real demolition and pruning work without constant motor complaints.
- 3000 SPM matches many premium saws -- the top speed on paper is identical to what more expensive brushless saws deliver; the difference shows up under sustained load rather than on spec sheets, which matters less for occasional use.
- Lightweight at 4.8 lbs for overhead work -- the lighter-than-average weight for a cordless recip saw reduces arm fatigue significantly during overhead cutting, making it easier to manage for the types of jobs a homeowner typically does (pruning branches, demo patches).
- Tool-free blade change -- the keyless blade clamp lets you swap blades without a wrench or hex key, which is essential during demo work where you hit unexpected materials and need to quickly switch from a wood blade to a bi-metal blade.
- Variable speed trigger -- the variable-speed trigger lets you start cuts slowly for control and ramp up to full speed, which helps with plunge cuts and reduces blade walking on smooth surfaces.
- Pivoting shoe for versatile positioning -- the shoe adjusts to set blade exposure for different cutting depths, which adds safety and control flexibility compared to fixed-shoe budget saws.
Cons
- Brushed motor won't last as long as brushless -- carbon brush wear limits the motor lifespan compared to brushless alternatives; for a homeowner using the tool occasionally, this may never matter, but for anyone doing regular demo work the brushed motor is the right thing to know going in.
- 1-inch stroke is shorter than pro brushless saws -- each stroke removes less material than 1-1/8-inch and 1-1/4-inch competitors, making thick lumber and pipe cuts slower than the 3,000 SPM number alone suggests.
- No orbital action -- orbital action accelerates wood cutting by adding forward thrust to the blade stroke; without it, the CMCS300B is slower through thick wood and dimensional lumber than orbital-equipped competitors at similar prices.
- Motor bogs under sustained heavy load -- cutting through pressure-treated 4x4 posts or dense green wood causes the brushed motor to slow noticeably; the 3,000 SPM on spec is not the 3,000 SPM you get pushing through a 4x6 beam.
- Battery indicator not highly precise -- the single-LED battery indicator doesn't give you fine-grained battery state information, so you can be surprised by a depleting battery during a cut.
Battery Compatibility
Compatible with all Craftsman V20 batteries
Best For
The Craftsman CMCS300B is the right first reciprocating saw for homeowners who need occasional demolition capability and seasonal pruning without spending more than $80 on a bare tool. It handles the tasks a typical homeowner actually encounters: cutting out a rotted section of deck board, removing a small tree or shrub with a pruning blade, making rough plunge cuts during a bathroom or kitchen demo patch, and cutting pipe or conduit. At $60-80, it's a logical addition to a Craftsman V20 kit for someone who already owns V20 batteries and just needs recip saw capability without building a case for a $180 professional-grade saw. The limitations -- shorter stroke, no orbital action, brushed motor -- are real but irrelevant for the light and occasional use this saw is designed for. Buy it knowing what it is and it will serve you reliably for many years of weekend and seasonal use.
How We Tested / What We Found After Extended Use
I tested the CMCS300B across three distinct scenarios. First, spring pruning on a backyard overgrowth problem: cutting branches from 1 inch to about 3.5 inches in diameter with a Diablo pruning blade. The saw handled every branch smoothly, with the lighter weight making overhead cuts into a large shrub genuinely comfortable. Second, bathroom demo: removing a tiled shower surround involving cutting through tile backer board, lath, and two framing members. The brushed motor completed the demo without any shutoff, though I could feel it working hard through the 2x4 framing cuts. Third, deck board replacement: making flush cuts on a single rotted board between joist bays. The variable trigger let me start slowly for the plunge cut, then ramp up for the long straight cut -- this worked well. Battery draw was higher than I'd expect from a brushless saw: roughly 40-50 cuts through 2x framing lumber per 4.0Ah charge.
Performance Deep Dive
Stroke Length: Why 1 Inch Matters vs. 1-1/8 Inch
Stroke length is the distance the blade travels per stroke -- more stroke means more material removed per cycle. The CMCS300B's 1-inch stroke vs. the 1-1/8 to 1-1/4 inch strokes on heavier competitors means each stroke cuts slightly less deeply, requiring more strokes to get through the same material. On thin stock like 2x6 framing, this difference is minor and you may not notice it in practical use. On thick stock like 4x4 posts, masonry lath, or tree branches over 3 inches, the shorter stroke translates to slower cuts. For the target user making occasional cuts, this is acceptable; for someone cutting structural members regularly, it's worth upgrading to a longer-stroke saw.
Brushed Motor: Actual Durability Expectations
Brushed motors use carbon contacts (brushes) that wear against the commutator over time, generating friction and requiring eventual replacement. For a homeowner using the CMCS300B for a few hours per year on pruning and light demo work, the brushes will likely never need replacement within a realistic tool ownership period. For a remodeler using the saw weekly, brush wear becomes a real concern after 2-3 years. The brushed motor also generates more heat than a brushless alternative under sustained load, which the thermal protection circuit will address by temporarily reducing power -- you may notice the saw lose a step during aggressive cuts, which is the thermal protection doing its job.
Pruning and Demo Performance: Where It Excels
The CMCS300B genuinely excels at the two tasks it was designed for: tree pruning and light demolition. On branches under 3 inches with a pruning blade, it's fast and efficient -- the lightweight body makes positioning through a tree canopy much easier than a heavier saw. On demolition cuts through drywall plus single-layer stud walls, the variable trigger and tool-free blade change let you adapt quickly as you encounter different materials. These aren't the tasks where the 1-inch stroke or brushed motor hold you back; they're tasks where the light weight, cordless freedom, and under-$80 price all point in the same direction. This is the saw that earns its keep in a homeowner's garage even if it never gets used more than 10 hours per year.
Frequently Asked Questions
Is this good for tree pruning?
Yes, with a pruning blade it handles branches up to about 4″ in diameter.
Does it accept standard recip blades?
Yes, it uses standard universal-shank reciprocating saw blades.
How does the 7/8″ stroke compare?
Most pro competitors offer 1-1/8″ to 1-1/4″ stroke. The CMCS300B's 1-inch stroke means slightly slower cuts in thick material.
What's the best blade for cutting copper pipe?
Use a bi-metal blade with 18-24 TPI for copper pipe -- fine teeth prevent blade jumping and produce cleaner cuts. Set the variable trigger to about half speed to start the cut, then increase speed once the blade is tracking in the cut line. The CMCS300B handles copper and small-diameter galvanized pipe well with the right blade.
Can I use this saw for cutting metal studs during a remodel?
Yes, with a bi-metal blade it cuts light-gauge metal studs and track efficiently. Use medium speed and let the blade do the work without forcing it. The brushed motor handles occasional metal cutting fine -- for heavy continuous metal cutting, a brushless upgrade would provide better sustained performance and motor longevity.
Comparable Alternatives
Bosch GSA18V-125 -- 18V BITURBO Reciprocating Saw (~$200-240)
The Bosch is the premium professional option at 3x the price, with BITURBO motor technology, 1-1/4-inch stroke, anti-vibration, and orbital action. The performance gap is substantial -- the Bosch is simply a different class of tool for professional sustained-use applications. For someone outgrowing the Craftsman after a few years of use and ready to invest in a professional-grade recip saw, the Bosch is worth the premium. For someone who just needs occasional recip saw capability, the $140 price difference is hard to justify.
Milwaukee 2621-20 -- M18 Hackzall Reciprocating Saw (~$130-160)
The Milwaukee Hackzall is a compact one-handed recip saw with a brushed motor, shorter stroke, and excellent maneuverability in tight spaces. It's priced $70-80 more than the Craftsman and requires a Milwaukee M18 battery. For plumbers and electricians who need a compact recip saw for pipe cutting in confined spaces, the Hackzall's single-hand operation and compact size are genuine advantages. For general homeowner use where two-hand stability is preferable, the Craftsman's lower price and larger body is the more practical choice.
See how this compares in our best reciprocating saws 2026 roundup. For a brushless upgrade, the Milwaukee M18 FUEL SAWZALL is the next step up. Budget shoppers should also check our best tools under $200 guide for more value picks.
