Against kuffars make ready your strength to the utmost of your power, including steeds of war to strike terror into the (hearts of) the Enemy of Allah and your enemy, and others beside, whom you may not know, but whom Allah does know. Whatever you shall spend in the Cause of Allah, shall be repaid to you, and you shall not be treated unjustly. (Qur'an: 8:60)
Check out the photos of the miscellany of firearms in the hands of the security forces. Standardization doesn't seem to be their strong suit.