I'm just copy-pasting one of my posts from another forum:
"
....the Tavor may have been cutting edge back in early 2000s when we bought them but is no longer today (at least not the version our military SFs are using which is the basic TAR-21).
Given we are one of the first (if not the first) real-world users which put the Tavor through the paces in many obverse environments (desert, tropical jungles, extremely high-altitude tundra etc.), our inputs are likely to have been invaluable to IWI in designing and developing further iterations of the Tavor like the X-95, SAR-21 etc.
Unfortunately, forces under MoD haven't standardized on any of these improved variants. So we paid the price for going with a new, untested platform but got none of the reward.
The Tavor as it exists with Paras isn't the best gun around. Majority of SOF units the world over (including Israeli ones like Sayeret Matkal, Shayatet 13 or Police units like Yamam) would much prefer an AR-15 platform. The fact that many Paras still prefer to carry M4s (which are even older than TAR-21s) speaks volumes.
The TAR-21 lacks primarily in three areas:
- Bullpup design & position of ejection port makes transition shooting uncomfortable, difficult. It does have design features meant to deflect the casings, but the gases still make it not an ideal platform for those who are big on transitions especially in CQC.
- Not ideal to suppress. Also, exacerbates the already-present problem of gases from ejection port. New Tavor 7 incorporates a 4-position gas regulator to deal with the issue but this isn't on 5.56 TAR-21.
- Not very customizable. Yes, it can still take a day-night sight combo but due to lack of full-length rail they have to go with a "one size fits all" approach. Also, the options are extremely limited. No quad-rail on the handguard so use of stability-enhancing grips isn't possible either (something which even non-SF units like RR are routinely using nowadays).
Some of these issues were addressed in subsequent iterations of the Tavor but like I said, our SFs haven't adopted any of them. Probably thanks to procurement lethargy. Buying weapons for an entire regiment involves hundreds of crores so not something that could be done at unit-level either.
I would much prefer the SFs to adopt a modern AR-15 platform like Daniel Defense MK18 which has excellent reliability (equal if not better than Tavor), and also acquits itself exceptionally well in all the areas where TAR-21 comes up short, as well.
But it appears we are intent on the FN SCAR...fine. I just hope the decision was made after studying inputs from units who have been using that platform (like SG, SFF, SPG etc.) and not just because its considered a bling rifle (like the Tavor was back in the day, and still is, in a way).
Personally, I don't think SCAR can match up to the raw functionality (and reputation) of a platform like the MK18."