I'm sorry, though the reinforcing collar on the socket of the bayonet does obscure the bottom of the sight, it doesn't stop one from using the sight, because soldiers aligned their enemy with the top of the front sight in battle.
It's true that British Soldiers only fired a few rounds before a bayonet charge in most instances, though not always, they still had to aim their muskets when they were ordered to "present" their muskets. I've already documented the fact British Soldiers were taught to "fire at marks" or AIM well, at least as far back as the FIW/Seven Years War. Even when firing in volleys, they still were expected by standing orders in the manual when ordered to "present" that:
“..raise up the Butt so high upon the right Shoulder, that you may not be obliged to stoop too much with the Head, the right Cheek to be close to the Butt, and the left Eye shut, and look along the Barrel with the right Eye from the Breech Pin to the Muzzel….
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[6]
The Manual Exercise, As Ordered by His Majesty, in 1764…. The copy used here was printed by Hugh Gaine, New York, 1775. Although this document was very widely reprinted, the text of the manual exercise portion does not vary with the exception of typographical changes. Popular military writer Thomas Simes advised, “
Great attention must be had in the instructing of recruits how to take aim, and that they properly adjust their ball.” Simes, Thomas,
A Military Guide for Young Officers (London, 1772) 196."
If you wish to look at a copy of the original manual, the information in the first quoted paragraph above is on page 11.
The manual exercise, as ordered by His Majesty, in the year 1764 : together with plans and explanations of the method generally practised at reviews and field-days ; with copper-plates : Great Britain. Adjutant-General's Office : Free Download, Borrow, and Streaming : Internet Archive
IF all the Soldiers did was "point" with their muskets, then during volley fires when they ****** the triggers, ALL the musket balls would have flown right over the tops of their enemies. This further shows they did indeed AIM their muskets when firing volleys.
Gus
Edited to add the correct page 11 on the original manual for the explanation of "present," which includes how they wrote to aim the firelock in the manual.