I have never really been a huge piston-driven AR-15 fan. The extra weight, complexity, and lack of real benefit for me as a fairly low-volume civilian shooter left me convinced that a well-built direct impingement rifle still offered the best balance for people like me. So when Franklin Armory offered to send out one of their OPS-16 rifles, I figured it’d be another chance to reaffirm my somewhat anti-piston-AR stance. This fairly new rifle is intended to be used with Franklin’s Binary system, but I’ve decided to abscond with the BFS and instead review the standard, 16-inch 5.56 rifle configuration, which uses a low-profile, self-regulating Osprey Defense piston system that aims for cleaner operation and suppressor compatibility without the usual adjustments or swapping out of other components.More Firearm Reviews @ TFB: TFB Review: FX DRS Tactical - Air Rifle Meets AR TFB Review: 2,500 Rounds On The H&R 635 9mm Subgun Fudd Friday: Review - The Swedish m/38 Mauser Franklin Armory OPS-16 Specifications Product Link: https://franklinarmory.com/shop/firearms/franklin-armory-ops-16/Franklin Armory lists the following details for the standard semi-auto model:Caliber: 5.56 NATOBarrel: 16-inch lightweight contour, 4140 steel, nitride finish, 1:7 twistGas System: Osprey Defense low-profile self-regulating short-stroke pistonHandguard: 15-inch M-LOK with integrated barrier stop and full Picatinny top railMuzzle Device: Franklin Armory Triumvir linear-compensating flash suppressorReceivers: Flat-top upper, FAI lowerBolt Carrier: Salt bath nitrideTrigger: Standard semi-automaticStock: B5 Systems SOPMODGrip: B5 Systems P-Type 23Weight: Approximately 6 pounds 14 ounces unloadedSights: Optics readyMSRP: $1,349.99 (currently on sale for $1,215.99) The Osprey Piston SystemThe main event, as it were, with this rifle is Franklin’s take on the Osprey Defense piston design. It stays low-profile inside the slim handguard and automatically manages gas flow. The company states you can move between suppressed and unsuppressed use, or different ammunition, without manual tuning, which, if you’ve shot AR’s loing enough, either means they have a very specific tuning, or the rifle is just always overgassed to ensure that every type of ammo will run through the gun without the need for tuning. However, unlike your standard overgassed M4 Carbine, the excess gas in the Osprey Piston System vents forward around the piston, bleeding off the excess that would normally go back into the chamber/feeding area. The design also drops traditional piston springs, which reduces parts count and potential friction points, further reducing maintenance items and possibly even replacement parts. The BCG before testing began, notice the distinct lack of a gas key, instead replaced with a strike face/solid gas key. Accuracy, Ergonomics, and PerformanceThe 15-inch M-LOK handguard offers plenty of space and a surprisingly useful integrated barrier stop. B5 furniture, as usual, feels comfortable and familiar, and I have noticed that B5 Systems furniture tends to be slowly sneaking its way into more factory-default builds over time, compared to Magpul or classic M4 furniture. The rifle shoulders naturally and balances well for a piston gun, but like any piston gun, it’s pretty front-heavy compared to its DI contemporaries. Accuracy with 69- to 77-grain match loads hovered around 2-3 MOA at 100 yards, but I had some Phenominal success with my .223 55-gr Nosler hand loads, just a touch over 1” in size at 100 yards. I’ll give myself a pass because of the rain, but I think it's safe to say the rifle is at least accurate enough with most ammo. Regular bulk 55-grain 5.56 PMC is what I mostly shot out of the rifle. That ammo opened up to the expected 3- to 4-MOA range, which is partially on me and my available magnification level, and half on the fact that bulk 5.56 just isn’t that accurate out of most rifles. Although I spent very little comparative time shooting out of it, the muzzle device seems to work just fine. It’s advertised as a linear compensator and works as such, but really doesn’t change that much, especially when the rifle is outfitted with a suppressor, in my case, an old Form 1 can that is not in any respect a low back pressure design, but still didn’t generate nearly as much gas thanks to the Osprey piston system. Here you can see that there is still gas coming out of the ejection port, so this system does not eliminate gas blowback. So, in my observation, the system delivers what I perceive to be noticeably less gas to the face when suppressed, even when equipped with a higher back-pressure suppressor. It does not, however, eliminate gas. The bolt carrier group, to me, also seems to stay cleaner than on a comparable DI gun after about 500 rounds, when I took the photo below. The rifle ran nearly 750 rounds of mixed ammunition by the end of my testing over these last few months, both suppressed and unsuppressed, with zero malfunctions with factory ammo. Recoil feels soft and manageable, closer to a good DI rifle than many of the other piston platforms I’ve had the pleasure of trying. At under seven pounds, the OPS-16 avoids the heavy and rather unbalanced handling characteristics that most piston AR’s give you. The OPS-16 seems less “front heavy” than other piston guns I’ve tried. How it Compares to Other Piston AR’s I’ve triedAgainst adjustable piston rifles such as the HK MR556 or the Sig Spear’s short-stroke piston system on rifles like the newer Spear LTs, the OPS-16 wins on simplicity, price, and overall better balance in my book. Against virtually any DI rifles like a standard BCM, Aero Precision, or Daniel Defense rifles out there, you gain better suppressor performance and a cleaner action, but lose some of the raw simplicity, lighter weight options, and broad aftermarket support that the original AR-15 design offers its users. I do like the inclusion of the low-profile barricade stop as it's a neat feature that I think can come in handy for a lot of shooters, and reduce or eliminate the need for another part to install. If you shoot suppressed frequently, the OPS-16 could be considered a boon to your health as it does help further reduce gas to the face, but any high-volume shooter will know that accessories and systems alone won’t be enough; you’ll need to wash up real good after each range session if you want to keep those lead levels down and possibly take more frequent breaks from shooting if you can. If you mostly shoot unsuppressed and prioritize minimum weight plus maximum parts availability, a solid DI gun with a solid flash hider or blast can would be my preferred option for reducing exposure to the typical run of toxins. Final ThoughtsAs much as the OPS-16 has addressed most of my piston AR complaints, I still think piston systems will always add weight, cost, and complexity compared with a quality direct impingement rifle. The lightweight barrel heats up faster during sustained fire than heavier profiles, which will inevitably lead to your groups opening up faster with sustained fire. I can’t currently assess the long-term durability of the proprietary piston components at this time, especially since I can’t legally review any “rate-enhancing devices” in this state anymore. The price sits a tad bit higher than a similarly equipped DI build, which may give budget-conscious buyers pause if they’re indifferent about a piston versus a DI system, especially given that many modern suppressors feature low-back-pressure designs, which somewhat negate the gas reduction that piston systems typically deliver on AR-15 rifles. All that is to say that as a rifle, the Franklin Armory OPS-16 will not win over every piston skeptic. It does not need to. I’m still not fully convinced myself, but I do think it smartly delivers the practical benefits most people actually want from a piston AR: reduced gas blowback with a suppressor, cleaner operation, and reliable function without constant fiddling, and best of all, it's pretty dang accurate in my experience. The self-regulating Osprey system performs as advertised in real use, although, since I don’t currently have access to a low-back-pressure suppressor, I have no way to compare that performance to the OPS-16 on a similar non-pistol rifle to see if the juice is really worth the squeeze here. Despite their perceived nature being more of a fun-focused company that would more often like to mag dump into trash with its rifles, the OPS-16 seems like it is more of a refined, low-maintenance choice in a segment that has often delivered the opposite, and for those that can, it still can run with the Franklin Binary Firing System. Would be interested to hear your thoughts on what you’ve seen here so far, and if this is the type of rifle you’d pick up in this day and age to run with a suppressor and possibly even a Binary or forced reset style system. 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