I experimentally bought a 3D printed extended bolt release and, due to shipping timing, tested it for the first time during a tac rifle match (IPSCish). Bolt release broke off during the first stage. I took it out and reinstalled the original one using no tools except for a bullet tip in about 3 minutes. I completed the rest of the 4 stages in the competition unknowingly having reassembled the receiver cover incorrectly -- only one side properly engaged the receiver. Inspite of this I experienced no malfunctions and was hitting the long range (100m) targets on my first attempts. I only found about it after I was packing up the CZ and getting it ready to go back home.
I mostly shoot $0.22 non corrosive bulk rounds. Recently the price climbed to $0.23. I know it is non-corrosive because I leave my rifles marinating in gun powder residue for a few days or weeks after shooting and before cleaning. I've never found any rust in my CZ.
I've only been doing these tac rifle matches for one season. I'm just an average shooter. Nothing exceptional. The five round mags are indeed a handicap when everybody else and their dog are on ARs with 10 round mags. However I seem to consistently rank in the middle of the pack. I use an ambi mag release, but no extended bolt release yet. Muzzle flip/recoil is nicely tamed with a 2 piece special forces brake. I don't attribute my ranking in the middle of the pack to my shooting talent. I suspect it's got to do with how common it is for ARs to malfunction making some shooters finish with a bolt action rifle instead of a semi auto. The CZ never lets me down and keeps on going well after my peers' ARs quit because their bolt got dry or it decided to undergas, etc.
I buy 4 for $75 or 1 for $25. Used military pop riveted. Never had an issue with them and during these matches they do get dropped in the mud or on hard ground.
What kind of mag release and safety lever do you have in that picture?
The ambi mag release and ambi safety are both from Corwin-Arms. The ambi-safety he carries is a 45degree throw, and just so much nicer than the stock one.
The mag release is also very well done - I push forward with my trigger finger, and then use my weak hand to bring up a new mag and "slap" the old one out as I'm bringing it up, and as the new mag goes in, my trigger finger only has to go up an inch or so to get on top of the bolt release and drop it. When I get it right (and it's a matter of practice, which I don't do often enough), it's smooth and efficient and fast.
The bolt release is a NEIT bolt release (NEIT is NEA before they became NEA). LONG out of production, but, oddly, they show up NIB on the EE every now and then.
It took a bit of careful dremel work on the NEIT release to reprofile a small part of the bottom of it to keep it from interfering with the mag release.
I do the occasional 3-gun match, and I'm generally a solid "middle of the pack" competitor with my AR. Might switch over to my 858, just for fun. What keeps me in the middle of the pack isn't rapid mag changes or being super ninja tactical. I'm on the downslope of my 40's (closer to 50 than 40 at this point), with the reflexes and bad knees to match. What keeps me in the middle of the pack is, well, I aim. I don't take missed target penalties.
The vast majority of my shooting is wandering around the prairies alone shooting gophers, or the bush alone hunting. My main reasons for doing the odd match is to:
a) work on my ability to rapidly acquire and shoot (which is a valuable skill for all shooters). Sucks to let a gopher or deer get away because you're slow to shoulder, aim, and fire.
b) keep my safe handling practices where they need to be. Wandering around the prairie or bush alone with a gun in your hand, where "safe direction" is 360degrees for miles around, and with no one keeping you honest, and, well, some of you handling practices can slide (just being honest here). Running (Ok, hobbling around with the haste) through a 3-gun match, with people milling around behind the firing line, and an RSO right behind you within "punch you in the back of the head" distance ready to DQ you the moment your handling practices slide, really forces you to make all your safe handling automatic and second nature.
c) It's a hoot. Great way to spend a Sunday.