I loved and miss my RFB, I had an XCR-L and while it was nice I dont miss it like the RFB. The XCR is an incremental improvement on an old design, there are many similar platforms, many of which are unavailable to us. The RFB can be as accurate as an XCR-M (although I’ve heard of some great shooting XCR-m’s I’ve never seen a stock one shoot to that standard personally) but at a shorter OAL and with forward ejection. The RFB carries better (relating it to my MH and other non bull pup 308 rifles I have shot) it’s better in just about every situation except on the bench, the RFB has a strange recoil impulse, most noticeable on the bench and can be hard to shoot groups with, the centre of balance makes muzzle flip more noticeable and can take some practice to get used to the very different movements associated with the bullpup design, especially in 308. Also the RFB has a long throat, they did this for reliablility, so proper bullet selection is more critical, my RFB didn’t like anything under 168gr (amax), longer or less pointy projectiles worked the best for me. 110vmax’s were terrible, but they are very short bullets. That being said the RFB is more close range fire power than SPR, a custom barreled XCR has more accuracy potential or so I have heard. Set them both on a table I’d pick the RFB every time, it appeals to me more, but that my opinion. Go shoot them both and maybe others would be the best advice I could give. The tavor is reportedly coming out in 308 this year as well might be something to consider. On a side note, I just got a Troy PAR on an EE trade and I absolutely love that thing, didn’t think I would but it’s an awesome little gun for relatively cheap.
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My experience with the RFB was very similar, except I was able to handload for mine and get reliable function and sub 2 moa accuracy from everything from 110gr V-max through 165gr SST's, 1.5 moa was about the best I could do with my best load but it was not consistent enough to really call it a 1.5 moa rifle. I found it to be accurate enough for hunting, it was awesome on a sling while riding around on the quad, had a nice smooth recoil impulse when the gas system was tuned correctly for the ammo being used, and was just a really neat rifle. It was however very difficult to shoot tight groups with off the bench, it was very awkward to support properly resulting in most people not liking the accuracy they could get from it.
I've only shot one XCR-M, a friend of mine used to have one, with his handloads it was about the same as the RFB for accuracy but was much easier to shoot from the bench, it was however nowhere near as nice to carry in the field.
Both rifles are reliable and accurate enough for field work. Don't buy either of them if you want to shoot from the bench and make groups on paper all day though.
I now own a Modern Hunter in 6.5 Creedmoor, I think I've finally found my load for it and have printed a couple groups now right around 1 moa (best was 0.98 moa). It handles great, has great ergonomics, and has proven to be very reliable so far with only two failures and both appear to be magazine related.
I still miss my RFB once in a while but would take my MH over any other non restricted 308 available to us currently, I'd take the MH over either of the AR-10's I've owned as well and one was a very nice Mega Arms build.
The 102 looks to have potential but so far I'm not impressed with the build consistency being reported, too many problems considering how few have been released so far. If they can sort out their QC issues and dump the "match" chamber in favor of something a little more forgiving they will definitely have a rifle worth looking at.
The Troy PAR is very interesting as well, I'd definitely like to try one some day, same with the Famme. I liked my Swiss Arms classic green so figure I'd like the Famme except the price of magazines for the 308 version are ridiculously expensive. I don't know what the accuracy of either is like but I'd wager the Troy would win between the two in that category.
I've also spent some time with an Fnar, very nice rifle but my friend just couldn't get it to consistently shoot 1 moa even with handloads, still plenty good for hunting and very reliable.