18th Century Pistol and Long Gun Buckets For use on Saddles.

English 1704 Flintlock Pistol Buckets.

http://www.royalarmouries.org/line-of-kings/line-of-kings-figures-of-the-line/single-object/330;

If these buckets are dated the same as the pistols, then they are probably in the 1770s period.

http://www.cowanauctions.com/auctions/item.aspx?ItemId=92827;

18th Century Long Arm Bucket.

http://news.discovery.com/history/archaeology/artifacts-olympic-park-120611.htm;