I have searched a bit and read a couple threads on the differences.

Initially I wanted a 107CR to SBR but they are so expensive and hard to find I have put that project in the rear view mirror.


I have found a 107ur for 1300 and a 104ur for 1200.  Prices being about the same those of you who have SBRed either or both I was wanting your opinions on which you like more and why.


I generally know the pros and cons of 5.45 and 7.62 so I was looking for feedback more specific to those rounds in the 8" barrel.  


For reference all I have right now for AK's are a SAM7SF and a 20" Vepr in x54R.  


Thanks gents

I can give you my opinion of 7.62 vs 5.45 in short barrel

a few years back I went to a range with my AKS74U to shoot, a guy down a couple lanes from me had a YUGO 92 that he short barrel. long story short, he let me shoot his rifle and I let him shoot mine. I didn't particular like the recoil of it. he liked my 74U and said he may have made a mistake going with a short barrel 7.62

yeah im kinda leaning toward 5.45


thanks for the input

I like the 104 from an aesthetic standpoint.

Its not to late to get into 5.45 and it's an excellent round out of a short barrel. I have 2 104URs both Sbrs and both are amazing. The concussive blast is a lot less noticeable from the 5.45 then my draco.

I chopped down a 107UR back in 2009, and still have a Bulgarian AKSU with original barrel. For me the 107UR never really did well past 100m. IMO it was probably due to the 16" barrel being cutdown to 8" with an incorrect twist rate for that length barrel.

It was a lot of fun to shoot 762 out of such a small package but the Bulgy smoked it in terms of accuracy at any distance, especially at 300m. The 107UR was not able to score consistent hits at all but the 545 Bulgy was on point at that distance.

For unrelated reasons I got out of 762 altogether though if I hadn't I would have kept the 107, but it just never shot well after the barrel chop






Z

thanks for the input.  I dont really have any problem buying 5.45 ammo for the same price im paying for 7.62.  At this point im heavily leaning toward pulling the trigger on the 104ur

 

thanks for the input.  the twist rate on the 104URs is correct for the shorter barrel right ?

 

I have both a SLR-106UR and a SLR-107UR. Both are SBR's. While the one is chambered in 5.56, lets just say it's about equal to shooting one in 5.45 for what it's worth. Very similar. Marginal, low, no recoil.

I have provided a video of me shooting both the 5.56 and the 7.62. I prefer the 7.62 SLR-107UR after becoming more accustomed to it and shooting it a bit more frequently. The recoil is manageable, and with the 4-piece booster, flash and muzzle blast is effectively negated. Buy whatever will be the easiest for you to find ammo for and magazines.

recoil on the 107 didnt look bad at all.  Thanks for sharing those videos

 

It's not. That was my first time firing it after it had been chopped. I've got about 500+ rounds on it now, and finally got it zeroed this past week when I had the time. It's a fine shooter. I zeroed at 25, but intend on shooting it at 100 possibly next week using a USPSA target and see what happens. Obviously, at close range, the sights are fine, you can use the front sight ears like a caveman EOTech and just place the target between them and press the trigger. The short sight radius is the killer with the AKS-74u pattern.

You may see I'm sort of snatching the trigger in the 107UR video. The trigger was heinous. However, it's since broken in much more and it's not too bad!

One thing I will point out, and this has to do with the AKM Pattern bolt carrier which the 106UR and the 107UR share, they do not have the shorter truncated charging handle that the 104UR's have.

If you have any other questions regarding the 107UR, feel free to send me an IM, and I'll help you any way I can.

I'll post some Krink porn below. Just because.

From my understanding it is the opposite. The 107 is correct at 1/9.4 and the 104 is incorrect with a 1/7.87. AK74U's should have a twist rate of 1/6.3. I have a 107ur that is waiting for a stamp, but in rifle form it is one of the smoothest shooting AK's I own

I cannot comment on the 104, but I do have the 107UR and CR and I love them both.  Recoil isn't bad and the little 8" is a very accurate hard hitting shooter.  I guess I just like the idea of a 122gn projectile in a short barrel.  I'm sure the 104 would be cool too.

thanks for the input.  Initially I wanted a CR but they market price is just too much for me

Having shot both I prefer the 104. I thought the 107 even with the 4 piece didn't really mitigate recoil all too well; the 104 was much easier to perform follow up shots with.

I'd wonder about anyone saying the 107 is more manageable or as manageable as a 104. That's just not going to happen.

Cheap, steel cased ammo seems to all be the same price for the main 3 AK chamberings. After a stuck casing with an AK74 type though... once again steering away from AK's and their steel cased junk ammo.

You could be correct on that, it's been a while since I owned the 107. For sure the 104 has the incorrect twist rate but all the AKSUs I have shot with cut down barrels seem to be as accurate as my Bulgarian with original barrel.
My107UR just didn't like the shorter barrel at all


Z

I'm not sure anyone in this thread said it is more manageable.

I stated that it is manageable, because it is. It is not as smooth shooting as the 106UR, or a 104UR. There is larger amount of recoil and the sights do deviate more from the target.

thanks for all the input guys.  I ended up getting a 104UR from midsouth on GB for 1219 so the price seemed pretty reasonable for a NIB UR.

Got one in May too, I think from the same place, good guys. It's not over gassed, there is a gas block restrictor in all the new 104ur. It's my second 5.45, it had a slightly bent rear sight, but I fixed it with a vise and slight pressure. Sent in my form 1 right away, will be a long wait

I researched them pretty heavily in the spring, I was planning to buy one but put it off too long and they weren't available.

This info is all secondhand, so take it for what it's worth. Anyway, they should have a gas restrictor in the FSB to keep the gas down, once you cut it it may be ok with a booster or can, but without one it may not be getting enough gas to cycle.

It's possible that it won't cycle at all with the restrictor installed after you cut it.