Flex 24V vs Rigid Rear Handle Circular Saw: A Deep Cut Comparison

Introduction

Rear handle circular saws have become the go-to format for cordless framing work, and two recent releases have drawn a lot of attention: the Flex 24V rear handle circular saw with its stacked lithium battery, and the newest Rigid rear handle saw. To see whether the hype around the Flex holds up, both saws were put through heavy use-and-abuse testing in treated lumber, including full-depth cuts through 6x6 posts with no pilot holes.

The verdict after extensive cutting: the Flex is genuinely in a class of its own, while the Rigid remains a solid, capable saw for less demanding work.

Testing Setup

To keep the comparison fair, both saws were run with their strongest configurations. The Flex was tested with the 10Ah stacked lithium battery that ships with the saw, then retested with a smaller 6Ah pack to see how much performance depended on the bigger battery. The Rigid ran its 8Ah max output pack. The test material was treated 6x6 timber with no pilot holes, plus cross cuts, rip cuts, plunge cuts, and bevel work.

Rigid Rear Handle Circular Saw

The newest Rigid rear handle saw handled treated 6x6 material without pilot holes, but the cuts showed some clogging, and the saw audibly strained under the load. It got the job done, and for a saw at its price point it is a reasonable performer. The comparison simply highlighted the gap between it and the Flex rather than any serious flaw.

Flex 24V Rear Handle Circular Saw

The Flex 24V rear handle saw is built around stacked lithium battery technology, shipped here with a 10Ah pack. Cutting through treated 6x6 timber with no pilot holes, it produced no clogging at all, with large volumes of dust clearing cleanly from the cut. Even when swapped down to the smaller 6Ah pack, the saw stayed smooth and showed no sag, which is remarkable given how hard it was working.

The guard design deserves a mention: it rides right up and over the wood instead of catching on the timber, the same approach Flex used on its earlier steel-cutting saw. It glides over the material instead of snagging.

Beyond raw cutting, the saw’s features hold up well. Positive stops run from 22.5 and 45 degrees all the way up to 56 degrees, and the depth adjustment is simple and smooth. The shoe, guard, and other main components are magnesium, so despite looking substantial, the saw is not overly heavy. It also includes an LED light, a rafter hook, and an adjustable dust chute that can be pointed up or down to suit conditions.

Two minor notes from testing: the bevel adjustment is a little stiff to turn, which some users may actually prefer for a more locked-in feel, and the 10Ah pack that comes with the saw adds weight compared to running the 6Ah.

Cut Quality and Dust Extraction

Cut after cut through treated 2x6 and deeper 6x6 stock, the Flex kept its composure. Even after a long series of full cuts, the battery indicator still showed four bars remaining, and the dust extraction stayed consistent no matter the cutting direction. Plunge cuts through a treated 6x6 were described as flawless and effortless, something rarely seen from a cordless saw of this size.

Whether rip cuts or cross cuts against the grain, there was no clogging in any direction, and the saw’s sound remained smooth rather than strained. It is the kind of consistent performance that makes long framing sessions noticeably less tiring.

Conclusion

The claims around the Flex 24V rear handle circular saw turn out to be true: it is the most powerful and smoothest rear handle saw tested, with no sag even on the smaller battery, and the stacked lithium platform feels like a genuine step forward in cordless saw technology. The Rigid remains a fine saw for general use, but if you want the best cutting experience available right now and are willing to invest in it, the Flex is the one that sets the new standard.